I don't think that spine is AS big a concern with carbon arrows as it was/is with aluminum arrows. Charts, are infact, little more than guides. The whole, if you are close to the heavier spined arrow go with it stuff is just to protect arrow companies from liability. Not entirely unlike MAX reloading recipies (which keep getting lower every year, while actions keep getting stonger and lawsuits get more and more frivolous), its all to protect whoever is making the chart/arrow.

The spines on most carbons are fairly inconsistant, all things considered. So you shouldn't tell too terribly much of a difference, but if you are getting a stiff tear, then put a couple washers on the front, or amp up your tip weight some. Might even have to increase draw weight a pound or two...or just get some ACCs....because they hit like a hammer!