Right, some more info AND I had an epiphany overnight.
Remembering a previous post on here, I carefully undid the grub screw removed the rebound knob. Lots of crud around there including INSIDE the (hollow) rebound knob – enough I reckon to stop it turning a few clicks. So I cleaned that out, a quick spray of GT85 and voila, I have 18 clicks again. Fox tech docs say the factory setting is 11 clicks mines slower at 12 but with 70psi, but I’m happy with that.
The other thing re Dave Farmer’s comment – when I let all the air out I deliverarately pushed the forks down to the max. Some light green oil (about a thumbnail sized portion) spurted out, but that was it – not sure if this indicates the issue Dave mentions or is “normal”? As mentioned I could get the forks all the way compressed.
Fork feels good pumped up though 🙂