1, Get a new pressure plate, clean it very well with blue shop towels and brake clean and do not touch it on the friction side afterwards, even normal skin oil is bad.
2. Get the flywheel re-ground by a different shop, they used too fine of a stone, that is not an 80 or 90 grit finish and it has weird patterns off to the right like someone hit it with a cookie disc or something. Also clean it with blue shop towels and brake clean and do not touch it afterwards.
3. get a new friction disc and do not touch it
4, make sure there is no excessive grease on the input shaft or throwout bearing (or anything in there for that matter as even a little tiny bit on the friction surface can cause issues)

Do not let it get any greasy hand prints on any of the friction surfaces of the disc, pressure plate or flywheel!

Doing all that will cure any issue inside the bellhousing.

I am not causing global warming, I am just trying to hold off a impending Ice Age!