Well ive been having some similar problems, get someone with a bar to pus back the clutch lever so you can tighten it some, hand tightening it isnt always enough, also check the lever to make sure its not breaking. I have a dual diaphram pressure plate, and after tightening it more numerous times. My lever finally snaped off, i didnt check it before hand. But im sure if had a crack to start with. So check the lever make sure theres no cracks and that its not bending back. Good luck.