I don't know the science behind this idea that you should have a bow set at its peak draw weight compared to lower but I have heard this from many people. If you are finding 63lbs to be a bit difficult I would buy a 50-60 lb bow when you get a new one. It seems 60lb draw weights are very popular. For deer hunting 60lbs is more than enough. With my bow which has 50-60 lb limbs on it if I turn my limbs in all the way the bow actually goes to 62lbs so you may find that with some bows you can get more draw weight than what it is said to peak at.