my bike came with touring style grips on it. they're wider than stock and the throttle grip has a large lip on it that the palm of my hand can rest on for leverage. it works great. i can push on the lip area with my thumb for full throttle without repositioning my hand. also helps with overcomming return from the throttle spring. this type of grip might help you and with little modification. cant seem to find a good example of this style grip on the internet.