focusing is also tough with a digital camera using the dot method. you will realize that this lens will give you critical focus a sliver of an mm before your dot solidifies in the finder. me and some people noticed that some digital nikons have this tendency but not with most film nikons but thats a story for another day.
With the D200 and also the D700 I "saw" that with AI and AI-S lenses, fully open, the dot confirmation wasn't the same if you focused down from infinity or from near to far, and the best focus was achieved when the dot started flickering and wasn't fully stable. Without a camera in hand I cannot remember which of those trajectories was the best but I think it as from infinity to near...
Richard, keep well ! We have a saying here that you should indulge with enough Saké (or you favorite alcohol) till you see four feet instead of two under the covers of your bed, then sleep it off, and the worst of it is gone in the morning...