I see, then it makes sense from your OP (with a different account I assume).
You should look into how to generate backspin with your volleys. It comes down to early preparation, opening the racket a bit, with proper amount of power. It's difficult to explain it properly here, so I would check out some videos on the internet and then practice practice practice. Aside from the lob, a good volley is the bread and butter for right side players. Needless to say, you need backspin to make your balls less bouncy, but what you shouldn't do is add soo much backspin that it stops and bounces up. It needs both backspin AND decent speed.
If you don't add backspin in your volleys, then players at a higher level will have little trouble to return flat volleys, so this definitely checks out.
Same thing with bandejas, add a little backspin and they'll become a lot more difficult to read and return.