RE: broadheads
I think you will find that very few curve or lb shooters will entertain the idea of using mech heads. I know that I wouldn't use them and that is based on the personal experiences of people I know who tried name brand mech heads out of a high performace compounds and had multiple failures. Without exception they relegated the mechs to the garbage bin.
Speed and mass are factors in the penetration game and, while mass can be accounted for with a 'trad' bow, speed is not what it is with a compound. A cut on contact head, whether it is a solid two blade or a replaceable three blade, will always hold a more failure-proof advantage over a head that requires additional physical forces to operate correctly.
If all things are set up correctly on the wheel-less bow a fixed blade head will shoot "just like a field point" at hunting distances. Adhere to the 7P's and there is no need to try and cut a corner with mech's.
RC
(7P's: Proper Prior Preparation Prevents Piss Poor Performance)