Are they all Game Getter II shafts.The XX75 is they are made out of 7075-T9 alloy.Most of the Easton aluminum arrows are made out of 7075-T9 except a couple of models like XX78 are made from 7178-T9.And their Fall Stalker are made from 5086 alloy,really low tensile strength like 58,000 psi when compared to XX75 at 95,000 psi and XX78 at 100,000 psi.A 2219 is a 2219 with same GPI and spine it's just some have different tensile strength.If all your shafts are GGII they should be the same strength,some older shafts were not always marked as clear.