It' s hard to blame the broadheads, they are doing thier jobs obviously if they are getting complete pass throughs. I' d have to question the hit or the ability to track blood, if you truely did hit the vitals on both of them! Mech. heads only give ya a little more cutting dia., that might help some, but fixed head through the boiler, can' t get much better than that! Was it raining, and how far until ya lost blood? Did ya do a grid search?