Is there a calculation. Or could someone give me an educated guess. I shoot an elite tempo 70 lbs DW. 32 “ DL. I’m shooting a GT hunter Xt 300. 9.2 gpi. Finished arrow 455grs. Shooting 300 fps. Question??? If I went to an x cutter or something similar at 7.2 gpi. How much speed would I expect to gain???