I really don't think that it's anything to do with the clutch actuator system (master and slave cylinder). I believe that your issue is with gear box fluid weight. The GG clutches chatter at engagement with the certain fluid weight. I recommend that you try different weights of transmission fluid. I had good results with a 50/50 blend of Type F ATF and 10w30 motor oil. It's cheap enough to change the trans fluid that you can test different blends to find what suits you. Oil weight has a significant affect on clutch engagement, so spend a couple of $ and figure out what works best for you. It is a LOT easier to change gear fluid than swapping seals.
Don't forget to look at straight weight gear oil along with multi weight motor oil. Heavier weight oil will also cause clutch drag (hard to find neutral); once I swapped to the 50/50 blend it was very easy for me to find neutral with the bike running as well as reduced engagement chatter.
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Phil
(New bike pending...)
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