With the fatboy I just leave it at 9. With the Progress, I'm still experimenting. I have been using 3 1/2 on the face and 2 1/2 on the neck.
Fatboy at 6 for Derbys, 5 for Feathers. Mergress at 3 WTG, 2 XTG, 1 ATG. That is what experimentation developed for me. Larry