Bringing in an uncompressed .mov...when exported, comes out lower quality??

Question

hello
i am dealing with a project using adobe flash cs3 and final cut pro 2 on a mac.
i am exporting a quicktime from flash and then bringing that .mov into FC to edit, add music, etc.
when i export from final cut, i see that the clip isnt as crisp as it was when i originally exported from flash?
im wondering what could be the issue. the clip itself is short, roughly ten seconds, although, even if my final result would be a 300 mb clip to still retain that perfect quality, i won't mind.
when i exported from flash, i had to do different trial and errors to get it to keep its full quality. the aspect ratio is 720X480 .. although upon export trying an NTSC it was extremly pixelated. i just ended up doing an uncompressed, no codec, quicktime export...having the final result be 350mb for ten seconds! either way, i love the final result. nice and crisp.
i brought this into final cut...heres the problem, what i am assuming is happening, is there is a setting wrong in the sequence settings. here is what i have it currently set to:
in the general tab:
frame size 720X480 NTSC DV (3:2)
pixel aspect ratio NTSC - CCIR 601
field dominace none
editing timebase 30
compressor non
quality 100%
advanced - compressor none / quality 100%
^^^ i thought maybe the whole ntsc issue is what causes the slight lower quality, considering even though it is the same aspect ratio its not dv footage but just an uncompressed flash video quicktime
^^^ i tried changing the aspect ratio next to frame size to custom/ custom (3:2) ... everytime i clicked okay, and re-opened the seq. settings, it resorted back to ntsc automatically
also the pixel aspect ratio section (the one directly under) only lets you choose ntsc , square pix, or hd - there wasn't even a custom thing to choose for that one
the problem with my final export is that is has slight artifacting on the edges of things...
maybe it isnt the sequence settings, for when i changed the settings to this, the little video box in the canvas of the fcp interface has no artifacting.
so possibly it can be the export settings in final cut?
if i do an export in FC which is an ntsc, it comes out extremly pixelated
the closest thing i can get to 100 quality is doing an uncompressed 10 bit....which is still causing the slight artifacting on the edges of objects.
any ideas of what i can do to fix this problem? it would be extremly appreciated and thank you so much for taking the time to read this.
thankyou,
-Mike

Answer 1

UPDATE:
i discovered a way,
upon export,
instead of choosing uncompressed, i chose custom,
i then typed in whatever and exported...came out clean.
i don't know what uncompressed 10 bit caused artifacting though