For anyone who uses the spirfire broadheads or the spitfire max heads im curious as to how fast your bows are shooting and what kind of KE you have..I ordered a pack of the spitfire max heads with 1 3/4in cut and am now second guessing if I have enough power to shoot these heads with their huge 3 blade cut..Im pulling 66lbs,should be 70lbs but its off a little bit and im shooting a 450gr arrow at 260FPS,which gives me 68lbs of KE..Is this enough for the 1 3/4in cut of the spitfire max or should I trade them in for the regular spitfire with the 1 1/2 in cut??