Someone with knowledge of Mitsis can probably give a more meaningful diagnosis, but my first thought would be worn master cylinder as there is fluid leaking round the pedal, and it can make it feel notchy or stiff if the inside of the cylinder is worn.
Not to say there aren't problems with the clutch unit itself though - if it were mine I'd take it to a fast fit clutch centre and see what they think, they'll do it cheaper too if it needs doing.
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