I don't have this weapon, but I think that if you leave off the pinkie extension and shoot enough you will never miss it. If you shoot with the pinkie extension first and then take it off it will never feel right again. I would leave it off for 500 rounds or so to see if I could adapt to it. The grip size is the part that prints through tee-shirts (where I would carry this type of weapon) so I would want the grip to be as small as possible. So I vote to leave it off for the first 500 rounds (don't switch back and forth).