JB,

The easton charts are a joke! A 2117 alum spines out at 70lbs! Now considering you are pulling more then 28, it may be close but I would bet its still to stiff. There is alot of factors playing into it though.

You'll need to find someone with a spine testor to check them. And to my knowledge no its not the same as the spine of a rod blank....its the stiffness of the arrow where the rod blank acts like it has a back bone or one spot where it should be the top of the rod. Close but yet not the same.