Yeah lean was the consensus when it actually started and moved. We've regressed since then. Didn't touch it for a couple months and now it won't do anything at all. Can't say if the clutch is toast. Kinda have to diagnose one problem at a time.
Stock is not adjustable, but It should be. 0=stock & stock would be zero,
I would definitely do a compression, leak down & squish test, if you had a hole in your piston!
If You still have your clutch cover off, do a leak down with cover off. To check for leaks @ keyway