I don't really see any major issues. Your technique is better than most casual players.
For your backhand, your elbow...
Fingers should control the paddle and should not hinder or limit wrist motion.
If you have any more questions, ask...
I have a bad right shoulder, so I do alot of practicing with my left hand to save my shoulder for games. BH movement is...
Yeah, exactly. There's no point in having more backspin if they're going to mistake it for topspin and vice versa.