Looking at the Easton charts, I would say you have gone a bit stiff. It depends how long you intend to cut them? As a start I would look at the following spines for the respective length:-

30" 570
29" 620
28" 670
27" 720

OK you can compromise and shoot them at 30", but you will be shooting a heavier arrow than you need. What length arrow did you have in mind? How did you decide on the 570?