As a novice I tried to use a 320 and at least for me it was a real handful. The power just keeps on coming.
Maint wise they are just as easy as any other bike oil filter is a washable unit, valve adjustment would be a one every two years unless you were riding every day and revving the proverbial ...

Couple of suggestions:
First I would look at the actuating screw adjustment on the lever.
Look where the lever actuates the clutch piston and you will see a grub type screw with a lock nut
I personally like to set mine so there is next to no free play in the lever action. just try screwing in the ...