I think the "fall away" proceedure in the manual is somewhat close/ballpark at best. There is just no way to get a torque wrench in there to actually set the pre-load correctly. I think if you knew the pitch of the gland nut thread you could calculate the distance from Zero endplay of the roller bearing and just set the preload based on a negative endplay distance.
With the drag of the cables, and getting the frame level in 2 planes while the bike is in the air, just makes it very tricky.
I just went with zero endplay and added (tighten) the gland nut a couple of flats. If someone has a better way, please let me know.