I would put $10 that one of your little springs is about to fall out of your clutch.

Its a very common problem with OEM discs.

the 4 springs have little tabs on each side that hold them in. the tabs wear out from the heat cycling and eventually one side will get loose. This results in the little spring being able to move in and out a bit.

I'm not sure how it causes the clutch to feel catchy, but it definately does. I've had 2 of my own clutches do it and know of a few others