The gun is very tight in the hand, maybe too tight. Looking at the pics, I'm higher up on the gun then you. My thumb is coming to rest on the very top of the safety, not the safety ledge, the very top of the safety. As for being more around the right side of the gun, perhaps that is the case. However, I'm just about reaching the trigger in DA mode, so I'd be unable to wrap around any further to the left.
I do appreciate your efforts, but I'm thinking now that perhaps it's just not for me.