Nissan recommends that the CSC be replaced when the clutch is replaced, even with stock parts. They say it is something to do with contamination, but I think it is really just because the part is crappy. So much for "progress".
First thing, check the clutch fluid level. Consider bleeding the clutch line if there is no sign of fluid loss.
There is a chance that it is covered under the drivetrain warranty, but with an aftermarket clutch they might fight you on that one since the CSC directly engages the clutch pressure plate and any sizing error can cause problems. Did this clutch require a CSC adapter ring for proper engagement?
If it does need replacement I think the Z-speed is your best choice.
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