The last two times I've taken mine to Santa Pod if I hold my clutch at 3k revs (any lower and its fine) to start my clutch sticks and wont release until I'm at least half way down the track (I can get the pedal up with my foot behind it, but the clutch itself is still engaged), I'm assuming this is a slave cylinder problem too (and praying not a master one lol) (even better if it is just a cable). I need to get it sorted for next time as its pretty tragic getting a 27 seconds over 1/4 mile lol
Its a DE on 74.5k miles and have no issues other than if I try and pull away from 3k revs.