Arthur P,
Sorry about that, I am shooting the terminator 6075's and am debating about whether to go to the 4560's or another comparable shaft.
Somebody on the range last night told me to try the 125 grain head as well. He said the heavier head would break the spine down some and make the arrow perform better. I am bear hunting this fall (from a stand, over bait) so I am not sure if I should stick with the heavier, stiff arrow or something a little lighter.