i have a 45# Bear with a 26" draw length, yeah im a small kid, and i have 340 Carbons that im shooting with 75 grain tips, and i was told today that they arent the right setup at all for my bow. i looked on the charts, and almost nobody makes carbons that are right for my bow, but some make aluminums. So my question is, what does too stiff of a spine do exactly, and should i go ahead and switch to aluminums until i out grow the bow?