I can't just casually walk up there and chuck it. If I want to be consistent, I've found I seriously have to do everything in my approach, shot and follow-through like I think I am on the pro bowling circuit. I'm right handed, so as I release my shot I bring my right arm up high in a follow through, with weight on my left leg and my right foot sweeping behind my other foot (see below, but in mirror image). If I don't act like I'm on TV on the pro tour, I don't do well at all.
But I feel like a total tool doing it. 🙂