Sounds like there may be hope for me yet... My AC pole on my SJ measures 38" from pivot to pivot.
I'll propose a new measuring method and see what people think. Lower the pole all the way down until it can't go much further. Then measure pivot to the inside hull line. My SJ pole measures about 4.4" and 38" pivot to pivot in a straight line.
I don't see the merit in your new method. It leaves too many factors to account for, like pole mount position, or type of ski ( FX1,RN,SN,custom ), and height of pole mount.
A simple pivot bolt to steering stem measurement is more precise, as long as everyone measures from the center of the pivot bolt, instead of from the side on a slight angle.