Hi W,
It looks like you are happy with the job you did, and want more of the same precision 'fix', better than adrenalin any day.
I don't think there is much else you can do with the other gibs on the lathe, other than making sure they are perfectly flat. If you know someone with a surface grinder, that is only a ten minute job, but make sure they DON'T use the mag chuck, all it will do is flatten them out when turned on and machined, and when turned off they will still be bent.
When I did Darrens lathe, all I did was adjust them correctly, and they were smooth as silk with no wobble. It is just a matter of taking your time and striking a good balance. I also adjusted the leadscrew nut to reduce the excessive backlash that was on the machine.
Depending what mill you have, depends on what can be done. Tapered gibs on mills have been in use for a long time now, at least 25 years on the mill/drills, so yours might already have them. Again, correct adjustment of gibs and nuts makes all the difference.
Plus of course, as I always say, the correct lubricant, at very regular intervals.
Bogs