If you didn't change anything with the clutch assembly in the first place, the problem shouldn't be in the clutch itself.
 Sounds to me that there is a difference in measurements somewhere in the new parts you put in.
 This sounds nasty but it may cure your problem. Take it all apart and start over, first measuring every piece and make sure the dimensions are all the same, right down to the last detail.
 If everything measures EXACTLY the same as the one you took out and all is set properly it should work like a dream.