I cannot say for sure if there is any spine degradation, but the ST AXIS IME def lose their straightness (if they even had it to begin with). As MM said...inherent flaw of the C2 process.

... it's obvious you spent quite a bit of money on your Switchback...why go cheap on arrows? IME, most people would be better off shooting a cheaper bow with the best arrows rather than the opposite.

Check out the CarbonTechs or go with the GT Hunter Pros or A/C/Cs. Come hunting season shooting broadheads you'll be much happier.