2001 Honda Accord clutch problem

I have had a changed complete clutch but theroblem didnt dissapear.when the engine is cold clutch is good n pedal works on the bottom position..when am driving longer n engine gets hot the clutch starts to work in upper position.its same every day.sometimes when its hot the clutch is not slipping but when u starts from hill upress gas n releasing clutch it starts shake the whole car...i have higher rpm but it still shakes.something have to be wrong with clutch...we changed all liquid for new one,change complete clutch,nothing works...