You may have wear on the ends of the clutch push rod. You've gone from a thin worn stack to a new thicker stack and the worn push rod may not be long enough.
If you installed all the plates "sharp edge inward" that should allow them to slide outward smoothly and disengage OK. As mentioned, notches in the hub and basket can mess you up too.
It might be worth trying ATF (or an ATF/oil blend) to see if it helps.
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2011 EC250E
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