It looks as if you are marginally weak spine with that setup. Not awful but marginally stiff would be better. If you are going to get up to 70#'s you may want to look at the whitetails, rhino's and cheetahs with a .300 spine. You may also want to look at some other arrows in the .360 spine range, easton, carbon express, gold tips, etc.

Edit: Forgot to chnage the DL to 28" but you are still slightly weak.