Unfortunately for the OP, this is the part of the show where he will have to do whatever he likes best for himself because there is no way to please everybody haha.
I actually liked the gray background. If there is a way to lighten or darken it to distinguish it from your hair more, that would be a nice bonus as Rilo mentioned. But it’s not a deal-breaker to me personally. Having your hair blend in a little (not totally) actually makes your eyes all the more prominent as the focal point, and that’s a useful feature. And the really helpful feature is that having similar colors between background and hair makes rough edges from the chroma key drop-out appear less noticeable. A neutral background like gray also makes it easier to highlight the colors of products. As in, a red product doesn’t show up against red brick obviously. A gray background allows every color of product except gray to pop forward.
As for gradient backgrounds, that’s also a tough area of personal preference. For me, I’ve seen a few that look okay, but it’s really easy to look artificial or sterile or super 1980’s in a hurry if not careful. Whether that’s a good or bad thing depends on how much you like the ‘80s.
I gotta say I’m impressed with your chroma key work. I can see how trying to add a shadow on the side (modifying the light configuration) would cause problems with the evenness of the green screen. What about moving yourself maybe five feet in front of the screen so the side lights are minimal spill onto the green, then light the green independently with a light that’s behind you? As in, maybe taking the current front light and moving it between you and the green screen to give the screen independent even lighting? Hopefully a cleaner green screen would keep your post-production work easy.