Need help w/ my clutch

Ok heres the problem. My clutch gets hard to push in when the engine and transmission warms up, also there is a popping sound. For the love of God someone plz help me figure this out so i can fix it. I recently replaced the cable (yes its routed correctly) and put a firewall adjust on it. The previous owner had already installed an aluminum quadrant. Now I had someone push the clutch in after i got the car nice and hot and the popping is definately internal. It is not the cable/or the firewall/or the quadrant. So my pea brain thinking is the clutch itself or the flywheel or throwout bearing or the clutch fork. I would like to pinpoint the problem b4 i get into all the removing of the driveshaft, tranny, exhaust not nessesarily in that order. Could my flywheel be warped? Can a clutch fork go bad? Oh yeah and b4 yall ask yes it did this b4 the new cable and firewall adjuster. Plz Help Me. I beg of you. On my hands and knees.

Thanks for your help. I have done exactly what you said too, but i cant really identify the problem other than its internal. I guess my reason for asking is because the clutch works perfectly so i dont want to replace the wrong item and i am on a very tight budget. I realize that it makes since to go ahead and replace everything while i'm in their but this is just not feasable (financially) for me right now. Anybody else. HISSIN you've always got something to say did someone tape your hands to your keyboard? Chime in one, chime in all. Even if it is just to make fun of me.

When cold the clutch is as smooth as butter. It is only after it heats up that the clutch gets hard to push in and starts popping. I do notice if i shift w/ the rpms a bit high (as in keeping the throttle pressed down a little and shifting at about 3100rpm or so) the popping noise does not occur. But it is still hard to press the clutch in. thanks for the help.