It’s more about your export settings than your capture settings. Especially since the videos look good on your pc. The best codec for YouTube is h.264. To experience less loss of quality though YouTube’s compression, create an HD timeline, copy and paste your SD timeline you’ve already made into the HD one, and scale up the size of the clips to fit the screen if you need to. (Not horizontally of course, just to the top and bottom.) The finished upload will have less loss of quality. Most vx Thrasher uploads are done this way now and many filmers like Chris Thiessen and Romain Batard have been doing it for awhile. There’s also the option of making the HD timeline 60 de-interlaced frames per second instead of 29.97 fps but this comes down to personal taste. If you’re using FCP or Premiere this is easily do-able but if you’re on iMovie or some shit then idk. Good luck
Edit: I didn’t watch your edit until now, I figured it was really bad upload quality but it honestly looks alright. Looks like you’ve already got the HD timeline thing figured out. You could get slightly more out of it by tweaking your settings here and there but not much. It’s still SD footage from a camera from 1995. Maybe you have HPX fatigue lol
I can see the tricks great, it looks good to me. All I can say is maybe try it at 60 fps. Hope you figure out what you’re looking for.