It still seam very odd to me, I cant work out why it would work as you have decribed your set up has not changed (apart from a new clutch) from the 4 speed set up that was working fine...........so the new parts are the new clutch, do think it possible that this is doggie.....otherwise its adjustment in the cable. Grab the cable at the fire wall and pull it hard, you should be able to pull some out from the fire wall, what does this do to the pedle....it the pedals on the floor then its to slack and needs to be adjusted tighter. I think fitting the short carrier is going make it worse and therefor an even alacker pedal...