It occurs to me you may not end up with what you want. You will get 3 positions with 3 different off sets, then 3 positions with 3 other offsets - but they will not be in sequence.
You will probably end up with something like this. The first three positions might be 20, 40 and 60 degrees. The second set will be 25, 45, 65 or something similar.
I dont think your going to be able to get 6 different steps in progressive order - but maybe Im wrong