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It's hard to tell from the pictures but it looks like the clutch has some "glazing". Basically oil burned into the surface.
I used to run a large industrial machine that used clutches that slipped all the time. It didn't take long for them to glaze up from heat and grease etc. Some of the operators were always tearing it down and cleaning the clutches. After a while I convinced them, that it can only get glazed so much and then they will stay the same. I just cranked up the air pressure and they ran for years with no more trouble.
A vehicle clutch only slips momentarily so you want it to have a good friction surface. If you haven't already done it, sand the pucks to ruff them up. If you are comfortably over the minimum thickness, I would put it back in.
I used to run a large industrial machine that used clutches that slipped all the time. It didn't take long for them to glaze up from heat and grease etc. Some of the operators were always tearing it down and cleaning the clutches. After a while I convinced them, that it can only get glazed so much and then they will stay the same. I just cranked up the air pressure and they ran for years with no more trouble.
A vehicle clutch only slips momentarily so you want it to have a good friction surface. If you haven't already done it, sand the pucks to ruff them up. If you are comfortably over the minimum thickness, I would put it back in.