Gregor,
0.001" per foot is pretty good. If it is good enough for the parts that you want to make with it, I wouldn't fiddle with it any more...
I did fiddle with it some more and got it down under .0001 over 11" so I'm more than satisfied as this is the limit of my ability to measure with the micrometers I have. Took a while but I'm very happy to have it so dialed in right now. I just finished a steering stem and it was nice to be able to hit the numbers exactly wherever I needed.
As for the manual: I ended up buying a printed one (which is nothing more than a copy machine copy of an original... or another copy - it's bad) off of ebay. I'd love to have a nice PDF copy as I keep all my manuals on my iPad as it's easier to keep clean than a paper manual. Sadly, our machines predate computers so unless someone types in a copy or remakes one using OCR and nice scans of the images it's unlikely to find anything other than the copy of a copy of a copy...
Gregor