another item to consider replacing if the slve has developed premature issues is one of these
https://cdn.shopify.com/s/files/1/02...G?v=1422460742
Having done plenty of clutches on 75/Zt over time, we noticed several in various states of wear / ridges etc.
If the sleeve is ridged / stepped etc, this will affect the motion of the slave in quite a bad way, maybe worthwhile getting one in there together with a decent slave and put the issue to bed once and for all !
I have one here if you decide to replace it, and can sort out a deal for you.