I prefer the Pachmeyer open back strap grips on my square butt revolvers.. I'm using Hogue rubber round butt with finger grooves on the rest. They seem to work OK and I am getting use to them.

I've tried the Miculek grips,, lasted about 12 rounds before I took them off and sold them.. ( some folks really like them, I hated them )

Just ordered the Hogue rubber, no finger groove, big butt grips.
Had a chance over the weekend to handle 3 different guns with them on. They all felt different so some fitting may be required..
but I'm going to give them a try for USPSA.

(edit: I have a large hand with short thick fingers. I hated it when Glock went to the finger groove frame ,the points hit me in the middle of my fingers )