Are you sure you have the clutch disc in the proper way? There should have been a tag which read engine side or something like that. Might sound dumb but it could happen.
I still think that it's this. The clutch disc raised area with the springs should face the pressure plate/trans side, check this and assure the disc slides on the splines easily. Is there a pilot bushing in your crankshaft end? if not, that can easily cause it to bind up if the crank recieving end isn't drilled deep enough. I've also had one once that the release bearing shaft was so worn out so much that it would not engage/disengage properly, it was where the fork sat in the bearing shaft collar, try this. Check the clutch fork length too i'm not sure about scattershield lengths, check with the manufacturer if you don't know.I doubt if it's the tranny.
Tom.
