I don`t know what you fitted to your motor but have experienced quite a lot of problems with new after market clutches and often find it is worth paying a bit more and fit genuine manufacturers parts sometimes,especially clutches with the hassle of g/box removal etc,a lot of the problems regarding concentric release bearings,the fact you now have a hard pedal after a clutch fitting suggests the parts are the cause if you didn`t have the problem before,good luck.
cdc, February 2014