i am shooting a 60 lbs elite z28 and it peaks around 62 lbs and the drawlength is 29 inches, i purchased 400 spine easton fmj arrows on the recomendation of the program on the easton website and had panned on cutting them to 28 inches, my buddies archers advantage software says that they are to weak and i need 340 spine at 28 inches? i dont know what to believe so any feedback would be great? before i cut them? anybody shooting them at 60 lbs and a 400 spine??