first, i didnt think your video quality was too bad, for the filesize. To render at about 3mb/min and still have it look like that isn't too bad a job. But, if you're looking for suggestions, you could try using your regular capture software, and then piecing together and rendering your vid in Vegas Video [it will render as wmv].
I use VirtualDub for my captures as opposed to the software that came with my card, and then do renders in Vegas 6 [I recently got After Effects though... so I may start using that].
The odd cuts I refer to are not the changing track cam views. I mean, on AH, you fade out your drift clip before weight has stopped moving on the car - I assumed it was to hide the swaying you got as you came out of the vid. I only noticed it on the track cam because I saw the g-meter going crazy at the bottom of the screen as it was fading. At Seattle you do a hard cut out of both of your clips before your car is stabilized - watching the g-meter on the track cam make me think you might have run into some nasty snapback immediately after the cut... who's to say. Things like that make me suspicious.
The weird fades:
At SSR5, on the track cam, watch the timer magically roll from 3:08 to 3:10, totally bypassing 3:09. Same with he bumper cam at DF - the timer rolls 1:00 to 1:02. But in both the DF and SSR5 cases, the other cameras showed the clip in full, so I assumed it was just an editting oversight. I gave you the benefit of the doubt, where I could.
But ya, I think that if in general you can make your entries and exit cleaner the overall appearance of your drifts will increase significantly - meaning, tidy up your steering. You should aim for them to look and feel more like your SSR5 drift - that one was leaps and bounds better than the other ones you included, imo. Infact, I think it was one of the best 2 clips I saw of that section. 👍