How does it move the "entire hand forward" when the rear of the grip is blocking it from moving forward? To move the hand forward, material has to be removed from the rear of the grip. That is the only way.
senior smoke , the wood you removed from the back of the grip got your hand as close as it was going to get. Adding to the front will change the feel but cannot move the hand closer, it is a physical impossibility. It will move the grip fingers closer by enlarging the grip size but the back of the hand stays in the same position.