I made the fatal mistake of shooting a Prime Centergy at my local bow shop. Now I’m angling to get one. My buddy who runs the shop recommended 80# limbs. I’m strongly considering it, because I have not problem drawing back the 70# limbs and I would be able to shoot a heavier arrow. I know I don’t NEED the extra KE and I and fully capable strength wise, so let’s table that discussion up front. I would probably back the limbs off to 74-75 lbs. My question: what are the speed benefits (70 vs 80 @ 29” draw and 425gr - at 70# my arrow is 292fps)? Guys talk about twisting the cables to get a few extra lbs out of 70# limbs - any drawback to this vs 80# limbs that are backed off? Will the limbs make the bow louder? Any other considerations? Thanks.