I asked RunningBear today about it, and they gave a 45 minute discourse on how to clean a VCR. They recommended using a DVcam to do the conversion, or reducing the capture size. I don't have a DVcam, and I had already considered reducing the capture size - However, I really wanted to oversample and preserve quality.
In any case, I'm taking my dual-deck VCR in to work tomorrow and they're going to give a tutorial on how to clean it. Should be interesting.
Rodimus also located newer capture drivers for the card, and I was able to get those installed.
If none of this works, my options are:
New SVHS deck plus cable
New DV cam
New capture card
None of which I really want to do at this point, but if I'm going to get the project done that I want to in the timeframe I want to get it done in.... I've got to do something. I can't finish it with all these damn video glitches.