You think you have it bad?
I play with the three finger technique and from birth my pinky was always curled up slightly - and it sticks out when I play. Can you imagine what that looks like? Haha.
It's unavoidable if you're a three finger player, and may be there if you're an aggressive two finger player too. Almost everyone does it, don't worry. Some people like to curl it, and some let if stick out like a mutant.
I don,t think it is unavoidable that the pinky will curl or it will stick out.
The key to me is to be relaxed, it is a sign that you tense up. When you look at all the greats who played 3 fingers, the only one who seems to stick his pinky is Billy Sheehan.