Slightly too little free play in the cable could leave the plates dragging a bit, couldn't it? I think that would cause that kind of symptom.
If the cable is too tight it should shift easy, if anything I would think. Maybe slip the clutch, but shift easy. If the cable is too loose, then the clutch wouldn’t fully disengage, making it harder to shift.
In any event, the slack in the cable is correct now after adjustment, but I still have the characteristics that were described earlier in this thread, as examples:
1) bike is hard to push when in gear with clutch depressed...usually is very easy. (But it is also a lot colder now.)
2) difficulties finding neutral, whereas before I had no problem
3) difficulties shifting into first, sometimes...although it is better since I reduced the clutch cable free play
Where is your shop located, and were they aware of the bulletin, or did you need to bring it to their attention?