Can you lift the back wheel off the ground:
1. Say all the oil settled and you did nothing yet. You put it in top gear, pull the clutch in, snap the back wheel back and forth to break the clutch pack free.
2. Once free, spin the wheel one way so the wheel spins a lot freer. Did it?
3. No joy, set the adjust nut screw. You're chasing a bent steel dragging on one plate and that's all you need to find out who?
4. Say oil is drained out, now leave it out. Why? Might need to pull plates.
5. This eliminates yanking the cover first is the adj, therefore, slack at the cable adjust, then turn in the screw in, back it out a 1/4 turn and retighten nut. Take up the cable slack so there is very little lever gap at the perch and lever.
6. This now makes it like a hair trigger, or say you are going to use as much throw at the rod so the pressure plate moves out farther to move away from the warp of said plate. If it's really bad, it still drags then. The hair trigger shows the way of either way.
7. You still have it up in the air, now you push or pull the wheel [whichever comfortable] up or down the one direction, but this time you just ever so pull the lever in until the wheel breaks free of the plates.
8. As they move away from each other way before the lever hits the grip, N goes like butter, not a sprained ankle getting there.
9. You won't hurt the parts for this next static test, but now bike down on wheel, light the bike off with trans in 1st gear.
10. Now find N. If it remains the same, pull plates... you saved from draining twice.
Notes:
a. Centrifugal force is going to fling oil off itself no matter the extra slight level. HD is a full quart.
b. Say the clutch is semi-dry, being a wet clutch would have a wet sump kind of pressure down the main shaft and dumps into the plates by drip, the centrif takes over and out the plates on the channel lines in the fibers.
c. Oil is more a bath of oil for the primary chain. I could be wrong, but it's hard for me to think more oil effects N, where it's always been the bent dick is the trick.