The chart only gets you close to the correct spine. What i would do if i was you for hunting, would be buy the 400's cut them about 2 inch longer then they should be. Then shot a bare shaft at 20 yards. It should hit well to the left of the target (Weak). Then i would cut 1/4 inch off of the arrows. Shot them again until the bare shaft is hitting in the group of fletched arrows. I would use 125 points too. The heavier the better, for hunting. Just my idea on what to do. Why do you want to get rid of the slams?