before you installed the rekluse, did you shift with or without the clutch? the only time i feel the autoclutch interfering with shifting is at very low speeds. once you are above 2000 rpms or so, the clutch is supposed to be a solid drive and shouldn't be any different than a manual clutch.
if you previously used the clutch to shift, it will have a different feel, and to make it easier, you need to rock the throttle when you shift to take the tension off of the transmission shift dogs and allow the gear to slide easier. most engines with significant rotating mass tend to be harder to shift w/o a clutch.
ned