Actually the easton charts will not tell you everything you need to know. A spine proram would get you much closer.

You need to take into acount how much more energy some of these new bows produce, especially the bowtechs. It is pretty common to come up underspined on arrows when using simple charts or the cheesy one put out by most carbon arrow manufacturers. There simply is not enough data in the eqaution to get an accurate figure for corect spine.

The easiest thing to do is just turn down the poundage on your bow and see if things get better. If they do, either leave it there, or get stiffer arrows. I normally pick my arrows a little stiff to begin with just to be safe.

Paul