So i'm thinking about revamping my competition setup. Bowtech Specialist, Limbdriver Micro Elite, and X Killers. I'm a little confused about X Killers. They are a 200 spine while I need a 350 spine and they weigh 9.5 gpi. The 150 gr points and adjustment points confuse me as well. It will be a super heavy shaft. Can anyone explain how this shaft works.