Motown, it's 5 grains per POUND, not inch.....

Your bow is warranted to 5 grains per pound. Shooting lighter than that voids the warranty. If you turn the bow down to 65 pounds, you'll be at 5 gpp, and VERY close to the same speed. There is absolutely ZERO reason to shoot a 325 grain arrow on 70#'s......Turn it down, or find a heavier arrow. You are gaining absolutely NOTHING and doing harm to your equipment. What's to think about?