Ashby's research shows the benefit of a heavy, weight forward arrow with a single bevel broadhead in increasing penetration. It's good stuff. Such a set up gives a greater margin or error on marginal hits. Keep in mind, though that folks have been killing a lot of game with lighter arrows and heads for a long time. Your arrows are a bit on the light side, but they should do the job on deer size animals. Your long blood trail wasn't a result of inadequate equipment, but rather poor arrow placement. It happens. Keep learning and keep trying. Oh yeah, and keep reading. It's one of the best ways to learn stuff. Good luck.