Yeah the spine on those is too weak even with the 75 grain head. Out of my FX @ 67lbs and 28" draw and a 26.75"arrow the 5575's were weak even with an 85 graib head. Your setup is pushing much more horsepower, definitely go to the 7595's and you'll not give up hardly any speed as they'll retain more energy. You'll probably even be able to go to a 100 grain head for your hunting setup.