250-500cc Clutch Adjustment - 1999 Wr250

I've been struggling with clutch drag issues for a while now. I've done the following:

Replaced friction (8) and steel (7) plates.
Filed the clutch basket and hub notches.
Replace the clutch cable.
Replaced the oil from 80W to 0W-40.

The adjustment screw is one or 2 threads out. If I adjust the screw almost all the way in, it makes a rattling noise from the clutch, when the clutch lever is pressed all the way in.

How do I go about adjusting it? Thanks for all your help.

Insert a flat blade screw driver in the slot to hold the shaft still and loosen the lock nut, then adjust the small center screw so that the clutch plates disengages as the arm on the short lever that the lower end of the clutch cable hooks to at the transmission is traveling through 90 degrees related to the cable. This gives the cable optimum leverage in the sweet spot of the clutch travel which gives it better feel and the easiest pull possible.