I have a friend with the same setup from Dennis and it works great. He is using a standard slave though.
If I had that problem, I would figure out how to reliably measure the total movement of the clutch shaft arm (the one that the slave connects to) and then measure it cold and hot. The movement should be the same cold or hot. If it is not, something is messing up on the hydraulic side of the system. If it is the same, then something is going on with the clutch system or the ZF main shaft.
On a problem like you are having, it will help immensely if you can separate parts of the system and then focus in on the root cause. If the hydraulic clutch part is working correctly, you can focus on the clutch release movement hot and cold, etc.
Mike
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