Which mouse for Claw Grip / Relaxed Claw Grip ?

Hand size : 18x9

I would like a mouse with a big bump behind because right now with my Razer Viper Mini, the only part of the lower palm that touches the mouse is the thumb side. I need something larger in that area.

I found the VXE MAD R Major+ which look very OK but the bump isn't that big compared to some Pulsar Mice.

Also what polling rate should I use while playing at 120hz and 180hz ?

Thanks !