I suspect all roads are going to point to Joe Nava; heard a bunch about him, all of it good.
I am struggling with my grip. I have three different factory grips for my Redhawk, in the last six weeks each has gotten a two week trial.
What I have observed is when I pick up my Redhawk with a new unfamiliar to me grip I get great groups. Within two weeks, shooting a now familiar grip, my groups open up.
My hand size is pretty average, 95mm accross the part Nil Griffe wants measured for custom grips, right smack in the middle of the range for standard size grips.
So I think I need to fix my brain instead of change the physical stocks on my revolver again.