I believe expandables recommend higher kinetic energy numbers than fixed blade broadheads. Quick math shows yours around 63 ft/lbs. Swhacker recommends atleast 60 ft/lbs. My set-up is around 85 ft/lbs, perhaps is why I've had good success with them? I recently switched to the swhacker, but would highly recommend the Muzzy and Slick tricks. Both fly well and hit hard, I've put plenty of Muzzy's through the shoulder/varies bones with great success.