Sorry just seen this, I have red rubber grease if you still need some.
EDIT If any one wants some red rubber grease, can give some in a packet or syringe for forum donations.
Ah, cheers. I (think) I solved it by letting a little excess fluid out of the system. At least, I did that and the piston appears to no longer be sticky, so hopefully correlation equals causation.
@Eejit started
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Sorry just seen this, I have red rubber grease if you still need some.
EDIT If any one wants some red rubber grease, can give some in a packet or syringe for forum donations.