Hey! i have the same problem with my hands and feet. Hyperdyrosis… The ONLY grip aid that has helped is the tite grip II. It’s an antiperspirant applied 30 minutes to an hour (I apply twice within an hour and a half before). And then I use gymnastic chalk on top of that. I have used the tite gripII on my feet so I don’t slip around barefoot or on flip flops.
I recently broke down and bought some gloves (doesn’t really help with the feet) just for days when I’m really slippery.