Here is my take on this. If you can pull 80 or 90 then why not do it. The thing I would caution you on is your arrows, are you shooting an arrow that is heavy enough for your bow?
I weightlifted for several years and trained with bodybuilders and powerlifters through that time, My bench was a crapload but like most who bench I also worked out my back and everything else.. Two years ago I fractured my elbow and still hunted that season pulling 71lb with the bad elbow. Since the elbow injury I struggle to lift heavy and rarely go to the gym, but have no issues shooting a 71lb bow.
my current plan is to get a Guardian and special order it in 80lb so I can shoot a heavier grain arrow and still get speeds around 300 fps in hunting conditions. I have yet to find weather where I can't pull 71lbs where I live so why not shoot a little heavier and beef up my arrow if I can pull 80lbs with ease?