Why you selling? Several TM's for sale recently. Do they not work as expected, too much hassle to use.....?
Mine worked just fine on the C14. I never noticed any additional vibrations.
As for using them, it's just a matter of readjusting your hand, then sliding over and rotating the TM with the right side of the hand. Once you figure out the technique, there shouldn't be any rpm or speed dropping while locking it into position. I always wear gloves when riding, so never tried it gloveless, but that might be a possible reason for having issues.
My reason for selling was because I sold the bike twice over - used originally on the c14, then bought an adapter to use the c14 kit on the fz1, finally sold the fz1 too. Btw, adapter still available