RooK
Supercharged
No that you mention it, it's mostly up-shift. 90 % of the missing shifts is up.
You think this could be an adjustment issue?
I know on mine. as the years went by, every time it wouldn't up shift nicely was because the clutch needed adjustment. I suspect it wouldn't disengage completely.
It only takes a minute to adjust it from the handle. Easy thing to rule out.
Change the oil, 5w40 is very light, that will definitely change the feel of your clutch. I use 10w40 only because of the cold climate here
Does it ever pop out of gear?