I am making a new board and am wondering where to put the inserts for this twin tip. It is my understanding the straps should be at a 15 degree angle to the centerline. My pads have plates with holes that are 15 cm apart. By my calculations, one of the holes should be about 1cm above the boards centerline and the other should be 1cm below the center. That would put half of the strap 7.5 degrees above the centerline and the other strap 7.5 degrees below the center line. Is this correct or should one side be 15 degrees above the center line and the side be 15 degrees below the center line?
What ever feels right for you would be my suggestion. if you are really worried go and look at some production borads and how they position them.
Personally I do not tend to duck my actual straps.
I do this because once in the straps I duck my feet, this sort of locks my feet in position.