was your other clutch sliping befor as that could of been slipping a littel so througing it high into the rev range and ther for you dint feel like you was ranging it hard but were as now you have to rev it hard befor you get any powere down coz your clutch is no longer sliping or maybe youve over looked some thing does it still boost the same as befor. 20 psi you should be running 22/23 psi