Describe your bleeding technique. On mine, when I let fluid out of the slave, the clutch pedal doesn't spring back up. I have to pull it. If I let the pedal snap up, it can get some air in the MC rod seal. So I put a piece of string around the pedal to pull while my foot is on the pedal. That way I lift the pedal smoothly instead of letting it snap.

Watch the throw-out fork when your friend pumps the clutch pedal. It should move about 12 or 13mm back & forth.

How about fluid inventory? The reservoir is so small that you'd notice a leak just by the level going down.

I can't see it firsthand, but it seems like you've checked all the right things & now it's time to think about problems inside the bellhousing.