I have a hard time believing that a 2312 with a 100 grain broadhead would weigh 458 grains, especially if you are only a 27" draw.
I agree. If I was you, I' d head to your local shop FAST, and get it figured out. Regardless of where you end up exactly....Matt is right. Your KE is gonna be low. Use
nothing less than a good cut on contact BH. Magnus stingers would probably be a good choice.