Hagon and Wilbers recommend a 135mm air gap. Hagon 5w oil and wilbers 2.5w.
I had the hagon set up, it was firmer but still harsh on small sharp bumps but with a hyperpro rear spring fitted the bike hsndled funny, felt high at front, low at rear, and running wide it corners. I removed the front springs and refitted the oe ones, all OK again but that harshness is still there even with 5w oil, guess it really needs a revalve.