File size difference between DNG Converter and Lightroom Beta 4

Hi,
I want to go the all-DNG route and am trying several things ATM. I want my files to be as small as possible, thus I disable previews and RAW embedding and enable compression in DNG Converter. In Lightroom, there are no options at all. What I do get, are pretty amazing file size differences:
Original .NEF as it came from my D70s: ~5MB
.DNG created by DNG Converter: ~1MB
.DNG created by Lightroom: ~4MB
The very small file size in DNG Converter is the one that bother's me most. I get these small files from time to time. I checked both the DNG and the NEF in Photoshop, and they seem to be identical. So my question is: What triggers these small file sizes? Do I loose anything? Or is the Lightroom DNG converter not as advanced as the stand alone version?
Maybe this helps: I get the ridicolous small files for very dull subjects that tell the computer scientist in me that it should be easily compressable by common compression algorithms.
Thanks for any pointers,
Markus

Thanks for the hint! It did make me revisit those files and now I see the reason for the small file sizes: The Apple Finder does note update the file size view once a file was added to a folder. Here's what I did:
Opened a folder full of .NEFs in detail view in Finder.
Converted them using DNG Converter
Looked at the sizes of the files as they were shown in the Finder window allready open.
Unfortunately, those file sizes are not correct. If I open a new Finder window of the same folder, file sizes are correctly reported as between 3.5 and 5 MB.

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<DbPrintLog>
Log statistics:
type total provisional total min max avg entries
count count bytes bytes bytes bytes as % of log
LN 1,641,390 0 635,530,086 37 38,103 387 35.8
MapLN 39,660 0 129,537,451 50 5,377 3,266 7.3
NameLN 5 0 426 35 111 85 0
DupCountLN 31,568 84 891,783 22 32 28 0.1
FileSummaryLN 2,978,385 0 203,225,292 28 38,130 68 11.5
IN 176,586 16,952 281,957,554 44 9,735 1,596 15.9
BIN 216,441 64,082 356,220,165 44 10,188 1,645 20.1
DIN 40,046 2,111 22,350,697 85 5,425 558 1.3
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Root 168 0 452,371 123 3,719 2,692 0
CkptStart 68 0 2,101 29 31 30 0
CkptEnd 66 0 4,179 57 64 63 0
BINDelta 175 0 17,715 35 1,507 101 0
DupBINDelta 22 0 3,996 51 1,361 181 0
Trace 450 0 69,440 46 305 154 0
FileHeader 178 0 6,764 38 38 38 0
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Total bytes in portion of log read: 1,774,085,278
Total number of entries: 5,167,763
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lnTxn ln mapLNTxn mapLN end-end end-start start-end maxLNReplay ckpt
End
0 6 0 3 10,016,254 10,002,932 13,322 6 0x2/0x3f7
e
0 21,291 0 209 20,537,114 20,353,908 183,206 21,294 0x10/0x87
198
0 10,557 0 141 10,187,476 10,044,801 142,675 10,723 0x14/0xb4
dec
0 41,526 0 900 46,753,313 46,610,643 142,670 41,612 0x203/0x7
25a0d
0 35,418 0 711 41,367,099 41,354,438 12,661 35,538 0x314/0x8
73648
0 7,992 0 187 9,537,017 9,521,859 15,158 7,992 0x349/0x8
025c1
0 10,424 0 185 10,332,196 10,238,081 94,115 10,426 0x34f/0x8
53765
0 10,467 0 216 10,123,100 10,110,090 13,010 10,562 0x353/0x8
71841
0 8,814 0 190 10,170,639 10,012,047 158,592 8,816 0x355/0x8
9b2d0
0 20,157 0 585 24,985,565 24,896,315 89,250 20,233 0x3d2/0x3
d2f2d
0 8,614 0 197 10,266,414 10,227,891 38,523 8,681 0x3da/0x4
13fdb
0 29,407 0 709 34,661,770 34,645,633 16,137 29,408 0x45a/0x8
861e5
0 8,512 0 203 10,694,331 10,622,804 71,527 8,513 0x46a/0x9
2fa20
0 17,131 0 349 20,149,317 20,118,102 31,215 17,153 0x470/0x9
54165
0 50,120 0 1,106 56,983,602 56,958,921 24,681 50,120 0x533/0x6
73a97
0 16,608 0 418 20,484,484 20,467,444 17,040 16,619 0x53f/0x6
e9f1b
0 16,920 0 395 20,846,145 20,819,500 26,645 16,920 0x557/0x7
b885c
0 9,033 0 219 10,860,030 10,834,496 25,534 9,037 0x56f/0x8
8a7da
0 68,165 0 1,762 90,245,785 90,214,129 31,656 68,168 0x68e/0x8
c67f3
0 9,140 0 200 9,904,174 9,827,759 76,415 69,294 0x800/0x8
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0 9,032 0 215 10,299,639 10,201,642 97,997 9,095 0x80a/0x8
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0 66,535 0 1,462 75,431,349 75,410,311 21,038 66,600 0x880/0x4
9cdcd
0 8,504 0 222 10,680,253 10,659,337 20,916 8,507 0x896/0x5
42f0a
0 17,543 0 632 20,080,030 20,050,546 29,484 17,546 0x89a/0x5
567a8
0 25,548 0 617 32,433,830 32,368,958 64,872 25,564 0x8d6/0x7
a8ace
0 9,710 0 238 10,564,761 10,547,253 17,508 9,728 0x8ee/0x8
328e7
0 21,166 0 884 26,557,127 26,363,082 194,045 21,167 0x93f/0x4
ea02e
0 133,812 0 2,755 133,366,171 133,318,671 47,500 133,887 0xb95/0x8
1fd49
0 39,793 0 844 41,359,213 41,308,651 50,562 134,394 0xbbf/0x9
6bab6
0 56,793 0 1,231 52,693,165 52,642,716 50,449 56,796 0xc0a/0x2
73c63
0 26,444 0 418 23,694,267 23,628,234 66,033 26,503 0xc1a/0x5
f9b1e
0 23,730 0 459 22,482,062 22,376,959 105,103 23,790 0xc52/0x8
57aac
0 10,907 0 264 10,299,749 10,258,468 41,281 10,980 0xc5c/0x8
a0d91
0 102,960 0 2,034 86,930,064 86,899,807 30,257 102,963 0xddc/0x5
b35a1
0 24,590 0 483 21,204,153 21,176,604 27,549 24,594 0xdf6/0x6
d955a
0 11,364 0 281 11,142,812 11,074,749 68,063 11,366 0xe06/0x7
f0576
0 12,678 0 230 10,256,884 10,224,320 32,564 12,697 0xe0c/0x8
2f0ea
0 23,613 0 434 20,392,697 20,349,744 42,953 23,728 0xe16/0x8
8eee3
0 10,843 0 182 10,415,971 10,370,611 45,360 10,964 0xe20/0x8
f47c6
0 8,959 0 274 10,281,193 10,168,378 112,815 8,959 0xe24/0x9
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0 10,454 0 235 10,273,473 10,202,560 70,913 10,563 0xe2c/0x9
7be70
0 39,113 0 945 36,005,999 35,971,748 34,251 39,193 0xe56/0x5
accdf
0 33,194 0 840 32,108,563 31,996,817 111,746 33,195 0xe8a/0x7
af972
0 31,440 0 556 28,736,169 28,605,453 130,716 31,530 0xedb/0x6
7b09b
0 9,723 0 265 10,446,985 10,392,967 54,018 9,840 0xee9/0x6
e82a4
0 8,672 0 280 10,230,643 10,179,976 50,667 8,788 0xeef/0x7
20797
0 10,486 0 279 11,046,145 10,958,538 87,607 10,491 0xf09/0x8
1fe18
0 19,908 0 417 20,242,451 20,187,638 54,813 19,948 0xf11/0x8
5b12b
0 10,081 0 302 10,045,293 10,023,247 22,046 10,081 0xf13/0x8
66218
0 9,882 0 235 10,053,363 10,004,937 48,426 9,882 0xf15/0x8
7328b
0 150,847 0 3,196 158,056,449 157,994,966 61,483 150,927 0xf90/0x6
98a8c
0 17,077 0 535 20,280,697 20,210,452 70,245 17,080 0xf98/0x6
dd305
0 24,492 0 778 30,374,091 30,330,071 44,020 24,540 0xfa2/0x7
38850
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66475
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97d96
0 18,655 0 545 20,290,674 20,201,008 89,666 18,655 0xfb4/0x7
ded08
0 20,961 0 680 30,230,987 30,091,976 139,011 20,964 0xfb8/0x8
17353
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430f5
0 22,711 0 1,061 30,151,192 30,123,976 27,216 22,775 0xfc0/0x8
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82955
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94cfc
0 19,100 0 511 20,029,210 20,000,131 29,079 19,180 0xfc8/0x8
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0 14,124 0 732 20,052,653 20,011,165 41,488 14,127 0xfca/0x8
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