I am playing with them and the medium one is great. The small is no use so I’d like to try the big one.
Fox say you can’t use it in a 165 shock due to it causing really high pressure when it compresses.
Being so svelte that I’m running 80 psi in my RP23 is it still a problem?

Guessing shock out of warranty so not an issue in that respect, however you don’t want to blow the air seals out the backend of the can on a big compression due to deformed seal grooves (and consequent written off air can)

If it’s that soft when was it last serviced?

It was Pushed in may. Was underwhelmed by its performance but put that down to only having 80mm travel.
The medium spacer has done a great job so was hoping the big one would be even better.

Compression can always be stiffened up to suit you better rather than having to run larger air spacers, always better to get the damper to do the work rather than the air spring.