Try using a continental grip and block the ball the next time you get a really low serve. Add a little backswing and forward momentum to it, so you can bring your body forward and not get stuck on your heels.
Stay away from the chip and charge and the forehand slice. The forehand slice is illegal in my eyes, unless you move in with the ball 100%.
If you find yourself chipping back to your opponent, you’re setting the ball up perfectly for them. Even though you made the return, you’ll end up being stuck on defense.