Following up Jacques about the grip, my observations....
If you grip like Hill did, with a bent wrist (lots of photos and movie shorts to verify this) and grip with the fingers in the pads between the first and second knuckles "as you would when lifting a heavy suitcase" you will notice that you are pulling the bow straight back into the meat of the hand. There is no fingertip pressure at all if the handle is the correct size, therefore you are gripping and applying pressure directly through the center of the bow from back to belly. Looking at Hill pics you will notice that the finger pads (between first and second knuckle) are lined up down the back of the bowhandle, his second knuckles are not lined up with the back like so many people do today. If the hand is rotated around the handle in order to get the first thumb knuckle in line with the belly of the grip, then in order to hold onto the bow with control you will squeeze with the fingertips, and that squeezing is off-center of the bow.
Learn to squeeze without using the fingertips but rather squeeze with the finger pads between the first and second joints. Also, if you have the proper placement of the handle into the palm, you can actually pull the bow and shoot with all fingers and thumb pointing at the target, completely open hand...( try that with your thumb knuckle in line with the belly, your hand will slip off the grip)...this means that you don't have to death grip the handle to keep it in place, the pressure of the bow weight during draw will keep it in place. Just squeeze a little more firmly with the bottom fingers to allow the bottom limb to bend correctly.