I want to start with something off-topic... RetroTy.com = nice job.
I took a gander at a dozen or so clips. I like that frame. I may have to borrow that idea for my own Youtube commercials project. I've been collecting commercials for about 2-3 years now as digital files, restoring them as perfect as possible. So far, I've only uploaded 2-3 of them to Youtube. I'll shift into full gear next year.
Your video is fairly well done, but I hear some audio issues that could be addressed in most of them. Definitely hang around here, and learn to work some magic with Audacity and Sound Forge
(especially using the exclusive digitalFAQ.com Sound Forge filters download
). Remove some hiss, some buzz, some fuzz, and then unmuffle the mono sound to sound more natural.
Where'd you get all of these? Your own tape recordings?
Getting back to the VCR...
This is probably just an alignment issue. I doubt heads or caps would cause such serious tracking-like problems. If it was a sudden change, not gradual, then there a chance that one of the guide posts slipped or something broke along the path. I don't work with non-JVC alignments too often, but this is what happens when a JVC deck goes too far out of spec.
Either get it professionally serviced (Jots, Southern Advantage, etc), or attempt a DIY job. Honestly, for alignment, I'd just get it serviced. There are special tools, kits and training that is needed for a proper alignment.