Whoa... hold up 2.5.... an Easton Epic that is 8.7 gpi is what like a 400? If you have a 30" draw... and your bow is 72#s.... then your spine is BIG BIG BIG TIME weak! That could well be your problem right there... that arrow might as well be over cooked linguine coming off that high powered sling shot. All that energy is being absorbed by the arrow in the form of over flexing. I'm not saying something else isn't wrong... but that definately needs to get addressed before you become a perminant crossbow shooter the hard way.