2315 is not the next stiffest aluminum arrow by Easton; it's merely the next stiffest arrow with a 23/64" dia. If you are not tied to a 23/64" dia. arrow, the next stiffest arrow would be a 2413, and it would also be a lighter choice than than the 2315 (it's also lighter than the 2314). Hope this helps.
Comparing the static spine (deflection) of the shafts, the 2413 is 7.5% stiffer than the 2314; the 2315 is 12.6% stiffer. So, there is a considerable difference in spine between the 2314 and 2413. Now, if the 2314's shoot fine and you just want a heavier, more durable arrow for hunting, but the same spine, the 2216 actually has the same stiffness as the 2314. BTW, I hunt with the 2413's and they are plenty durable--I used to hunt with 2012's and had no problems. If you're only hunting whitetails and turkeys, I say find the lightest arrow with the correct spine that allows your BH's to group with your field points and stick with that.
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