Quality of Clip captured using ProRes and clip converted to ProRes

I have captured the same clip in both HDV 1080160 and ProRes 422.
After editing the HDV version I export it using QT Conversion using the compression type "Apple ProRes." I then use the standard Compressor "DVD: Best Quality 90 minutes" preset unaltered. It looks fine in the Compressor Preview window. I then import the resulting files into DVDSP, and the quality is good.
After editing the ProRes version I export it using QT Movie using the current settings. I then use the standard Compressor "DVD: Best Quality 90 minutes" preset unaltered. It looks fine in the Compressor Preview window. I then import the resulting files into DVDSP, and the quality is bad.
Both clips are "ProRes" when imported into Compressor, and they both look fine in the Compressor preview window. The difference is that one was captured in HDV 1080i60 and converted to ProRes using QT, and one was captured in ProRes and exported as a QT Movie. Surprisingly, at least to me, the clip originally captured in HDV and then converted to ProRes looks much better than the clip originally captured in ProRes when they are imported into DVDSP. Both .mov files are compressed using the same Compressor preset, and the preset is unaltered.
I assumed the clip originally captured using the FCP ProRes preset would yield the better quality, but this isn't the case. I've tried capturing using ProRes 422 HQ, and the results are the same. I must be missing something, but so far I cannot explain it.
Thanks

I have tried at actual, full screen, using 1080p30 size from the original compressed to 4mbs (something my system can handle without blinking), 720p30, etc. etc. etc. Nothing stops the jumps. Even the activity monitor shows only 5%-15% processing being used by QT and/or FCP.
I plan to pull my old G5 out of the closet, it runs 10.6.8 and is still rock solid for video editing in FCP7. If it plays smooth on that 8 year old system then I know it's Mavericks. I'll try that tonight. It floors me though why the original 1080p30 will playback perfect via FCP and Motu, but once I turn of external monitoring and just try to play it via the preview monitor it is jumpy as **** and then the exported file does the same thing. So strange. I even deleted prefences of FCP and that does help with screen playback initially, but it always gets jumps in it after playing for a while.
I knew I should not have started using Mavericks and I HATE FCP10.

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General
Format                                   : MPEG-4
Format profile                           : QuickTime
Codec ID                                 : qt
File size                                : 168 GiB
Duration                                 : 2h 18mn
Overall bit rate mode                    : Variable
Overall bit rate                         : 173 Mbps
Writing library                          : aapl
Video
ID                                       : 1
Format                                   : ProRes
Format version                           : Version 0
Format profile                           : High
Codec ID                                 : apch
Duration                                 : 2h 18mn
Bit rate mode                            : Variable
Bit rate                                 : 173 Mbps
Width                                    : 1 920 pixels
Height                                   : 1 080 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 23.976 fps
Color space                              : YUV
Chroma subsampling                       : 4:2:2
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 3.484
Stream size                              : 168 GiB (100%)
Writing library                          : Apple
Language                                 : English
Other
ID                                       : 2
Type                                     : Time code
Format                                   : QuickTime TC
Duration                                 : 2h 18mn

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