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.