Shot a 60 lb max bow in 2014. Sent a 100gr G5 Striker through a bull elk at 40yds. Shot a 70 lb max bow in 2015. About mid summer I got curious and backed the 70lb bow down to 62 lbs just to see what sort of difference it would make to my point of impact at 40 yards. Arrows had about 2" more drop than they did at 70lb. When I saw that I decided that there was no reason to crank it back up. It is much easier to shoot for longer sessions and I can't see that I'm giving up anything.
