And it's not really that complicated, because having 5 positions makes it work out pretty neatly, i.e. a #3 of 5 is by definition dead average.
#1 - 20-30% above average.
#2 - 10-15% above average.
#4 and #5 are reverse images of #1 and #2.
Of course this is just what makes up an average rotation.