Thanks for asking!
this is the problem, the piston is free to move, is not linked to the slave by springs, if it had an indent when you take the pad also remove the piston behind it.
However this is not a problem as it is currently constructed on the brake!
if i put the lever HS33 on CSC slaves, if I manage to get a higher return of the piston, then i should change the attachment of the pad (probably with an o-ring, in this case the cnc backing pads are better!)
I'm glad that you have many questions, the brake is still not on the market, if you have suggestions may be taken into consideration!