I was taught that a bow shot closer to its peak weight will perform better and more efficiently. If you look at bow manuals even today, I am confident most will state this or similiar....I know my Bowtech manual does. Problem is when you are more comfortable at say.....65 lbs. for example, it doesn't make any sense to overbow yourself with 70 lbs., thus most probably hurting yourself performance wise if its too much to handle comfortably.