@ToddL i seem to have the same surface area from ski to ski. it has worked for me on all radars since 2013, several d3's and the KD Platinum.
for me 17.06 seems to work. i'm currently 2.455, 6.950. If i get in a slump or water temps change i go to 2.490, 6.850 or 2.480, 6.880
this has worked for me, hopefully it will work for others