I for one will keep my bow turned up. My Mathews is set at 66 right now, it' s a 70 pound bow. The cables or something have stretched, cuz 66 is all it will do. After the season is over, I' m haveing a new cam put on and new strings and such, hope to get back to 70.........where it will stay.
You may want to research that a little !! You probably just need your existing cable twisted a few turns !!
A cam will not change anything regarding your poundage !! And with a quality string set your bow may stay set longer......but it will change!! If your bow is fairly old or has had a lot of shots through it , you may need the cable bushings checked.....they will change your poundage some, but are an easy and cheap fix $5 last time I replaced any!!