The harshness* that I had attributed to too much HSC on my Pikes has pretty much gone after changing to the light *rebound* tune.
140mm RCT3 Pikes with 2 tokens / ~80kg kitted up / Mostly wheels on the ground C-Y-B type riding.
Previous best settings (Medium tune, as supplied): 50PSI in the air spring which gave ~25% sag (had previously tried higher pressure, but forks felt more harsh), Rebound 3 clicks from open, LSC 5 clicks from open. Didn’t think I needed the light rebound tune because there was definitely too little rebound if I opened the adjuster another click. LSC made harshness a little worse, but needed to reduce dive.
I had the lowers off for a service and thought I might as well try the light rebound tune to see what difference it made.
I’ve been running the light rebound tune for just over a month now, and it just seems to make the fork work properly for me. The harshness has gone, and I can run less sag / more air pressure so the fork feels more responsive and there’s still plenty of rebound damping available if required.
Current settings (light tune, per service manual): Air increased to 60PSI as the fork felt wallowy with 50 after the shim stack change. Rebound is now 8 clicks from open / 12 from closed, still with 5 clicks from open LSC.
I still think there is room for fine tuning these.
YMMV.
*Only on ‘washboard’ type surfaces – usually something like a well trafficked landrover track the front suspension would suddenly feel really harsh and the bike would actually slow down, almost if there was some sort of resonance going on (not headset bearings, wheel bearings, etc.) OK on rougher stuff.