I got a Speed Cobra double pedal. Despite the fact that I am asking this question I have been playing drums for many years! Just never felt a need to fix this problem like I do now.

I don't know how to set these up perfectly on my bass drum. The pedal is always tilting a bit left or right, and I don't think I can get it so that the left and right beater are the perfect even distance from the center of the head.

Apparently the Speed Cobra has a magical "para-clamp" or something but it was so magical they didn't really go over it in the instructions.
Looks like it has the same clamp as the Iron Cobra.

Tighten the round nut thing as tight as you can before tightening the wing nut. at least, that's what I've always done, my Iron Cobra's never tilted