I had a Hoyt MagnaTec with a built-in overdraw, command cams, 75lbs and 33" draw. Shooting 29" GoldTip 7595's that weighed right at 400 grains, 5.3 grains per pound, which was VERY light for my draw length and the bow's performance rating. Never blew it up, but I had to replace the axles several times one 3D season because they kept getting bent.

Switched to using 2315 aluminums at about 520 grains, 6.9 gpp, and never had any more trouble. I wasn't impressing anyone with my arrow speed any more, and it opened up my pin gaps a bit past 30 yards, but it didn't keep me from hitting what I aimed at. I won't go much less than 7 grains per pound again.