i'm no expert and i agree with all of what was said above - shoot what you are comfy with
I shoot about 62# and wouldn't go any higher - im a big strong guy and could pull back 70#, but why make it more of a "struggle" when you don't need it. jus my opinion
I see some shooters that have to strain and struggle (point bow to sky to get leverage, etc) to get back higher poundage - seem like a waste of effort