It sounds more like incorrect cable adjustment. If you don't have any freeplay in the handlebar lever, then you could get the symptoms described. Turn the knurled adjustor inward, free up the play and see if the symptoms go away or decrease.
When the clutch plates catch as you stated, it only affects the last part of the lever coming fully out. You sort of get a little jump as the bike pulls away properly. Bloody annoying until as you say you run a file over the grooves in the aluminium tangs.
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