Hey, I have had the same problem. My hands sweat a lot.
I of course use sweatbands on for arm, but it is not enough. I have tries multiple over grips now and have cone to the conclusion that i need to play with grips that have a “dry feel”
It is amazing and no matter how much i sweat, the grip feels dry.
And what grip do i use? Tourna Grip original. VERY IMPORTANT: it has to be the one that says Dry feel on the package Link to Amazon
It feels try and it stays that way.
Grips that are “tacky” do not work i my opinion. They might feel sticky, but when tour hands sweat a lot, they get slippery
Any chance you could look at the tourna grip as well?
https://www.amazon.com/Tourna-Grip-Original-Feel-Tennis/dp/B01M6CHVUI
When I played tennis this was some of the best stuff for sweaty hands (not adhesive backed)
https://www.amazon.com/Tourna-Grip-Original-Feel-Tennis/dp/B01M6CHVUI