Encoding AC3 produces low audio in CS3

Hi All!
I'm trying to encode a .wav file to ac3 with the surcode plugin that I have purchased, and the resulting ac3 file is quieter than the original .wav. I know this is normal, but I need it to match the original as close as possible. I've read that if you set the Dialog Normalization to -31, and the Dynamic Compression Preset to 'None', the resulting file should match more closely. The thing is, I swear I've done that in the past, and it worked, but now, it doesn't.
I'm producing a stereo track, with Complete Main selected, and can't think of anything else!
Any help/thoughts would be appreciated.
Thanks.
Mike

Totally agree Steve - the BBC have said the same to me in the past
Dialogue Normalization is a funny old setting - it actually refers to the amount of attenuation applied to the audio source with -31db meaning no attenuation, which should mean that the volume of the audio is preserved throughout the compression process.
There's a lot more to this, of course, have a look here for some plain explanations:
http://www.hometheaterhifi.com/volume72/feature-article-dialog-normalization-6-2000.html

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Bah, humbug! Let me hear what the talent is saying. I don't care if I can hear every nuance of that rock ballad, I just want to be able to follow the story, the plot.
Hey, I'm an old dude, you whippersnappers.
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Complete name : /Users/tester/Movies/export-tests/test24trailer.mpg
Format : MPEG-PS
File size : 12.9 MiB
Duration : 12s 576ms
Overall bit rate mode : Variable
Overall bit rate : 8 614 Kbps
Video
ID : 224 (0xE0)
Format : MPEG Video
Format version : Version 2
Format profile : Main@High
Format settings, BVOP : Yes
Format settings, Matrix : Default
Format settings, GOP : Variable
Duration : 12s 533ms
Bit rate mode : Variable
Bit rate : 7 995 Kbps
Maximum bit rate : 38.8 Mbps
Width : 1 280 pixels
Height : 720 pixels
Display aspect ratio : 16:9
Active Format Description : Letterbox 16:9 image
Frame rate : 59.940 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Compression mode : Lossy
Bits/(Pixel*Frame) : 0.145
Stream size : 11.9 MiB (92%)
Audio
ID : 189 (0xBD)-128 (0x80)
Format : AC-3
Format/Info : Audio Coding 3
Mode extension : CM (complete main)
Format settings, Endianness : Big
Muxing mode : DVD-Video
Duration : 12s 576ms
Bit rate mode : Constant
Bit rate : 448 Kbps
Channel(s) : 6 channels
Channel positions : Front: L C R, Side: L R, LFE
Sampling rate : 48.0 KHz
Bit depth : 16 bits
Compression mode : Lossy
Stream size : 688 KiB (5%)

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was wir lieben meistens nicht kriegen

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