It's not ALL about speed!!!!! If you shoot 312, that's great, but what is the weight of your arrow to get there. The overdraw only allows you to shoot a shorter arrow, nothing more, so if you are getting 312 out of your bow, you must draw close to 30" or you're shooting a "SUB-IBO" weighted arrow, which VOIDS your warranty. The OVERDRAW was big for Aluminum shooters, because to get the "right spine" on an aluminum arrow, you ended up shooting some HEAVY logs, whereas with carbons, it's quite easy to achieve IBO weight with a normal length arrow. The only thing an overdraw does is shorten your Braceheight, it doesn't increase your powerstroke, so it's not the same as switching to a shorter BH on the same bow. To do that, you have to change cams, angle of limbs, maybe even the limbs themselves, etc. You sound like you're pushing the limits in more than one way....BE CAREFUL!!!!

Looking at your signature verifies my assumption on the DL. I might add that a WB usually costs you 2-3fps, and for you to achieve those speeds would be difficult, unless you have a completely bare string, and your arrows are severely OVERSPINED for your set-up which will cause some serious flight problems, especially when you throw BH's on the ends of those arrows. Adding that MOST BT's NEVER meet IBO ratings, I'd have a hard time believing you're getting 312 out of that set-up even with those DANGEROUSLY short arrows, and I'd bet you can't get good accuracy much past 30yds with that SEVERELY mismatched set-up.

If you want that kind of speed get a bow that's designed to get that kind of speed, probably gonna be a 325+ IBO rated bow, and shoot arrows that are safe lengths for your set-up.