So...i'm shooting an Elite Tempo 70/29. My arrow of choice is a GT Kinetic with a 100 grain broadhead. Everything on the GT arrow selector shows 300 spine. My local shop doesn't carry any 300 spine arrows, they stop at 340. So, I bought them from Lancaster Archery. Why wouldn't they carry 300 spine arrows? I would think that my setup (70/29) is one of the more common setups. Are you guys shooting 340's out of similar setups?