^^^All of those.
I would suggest going to a mat.....either a good size mat......or a smaller mat and the plate as well. I generally hate that concept, but very few umpires call a true "zone" or give corners as a benefit of the doubt to the pitcher anyway. Now they'd merely have to determine pitch height.
Eliminate bats under XX oz.......IMO 28oz should be the lightest, but whatever your thoughts, there's should not be 24 and 25oz bats. With EVERY rule already benefitting the batters, we don't have to also help them increase their bat speed and control. You don't have to like it, but it would help the game a lot.
I'd get rid of the 52 ball as well as the Classic Ml. I like the concept of the 52, but the application of it could be improved IMO. People can deny that it's a "bouncy" ball, but my experience is that it's too bouncy. Technology 10 years ago with the 44/375 was a good combination aside from the altering of bats. Making them tamper-proof would have been a better solution than making the bats hotter and messing with the ball.