Thanks to all the bloggers who posted descriptions and pictures of their painting set ups. Other than making feel like a disorganized pack rack, they were very helpful.
In the end the solution came from my wife's decorating. We bought a new floor lamp to match one already in our living room, and moved the other lamps about. I now have a much brighter light source (including a lamp that shines directly over my left shoulder). Also I reduced and reorganized the amount of crap I bring to the table to reduce the chances of domestic strife through my own clumsiness.
Last night I tried it out while working on my SYW/FIW troops - I'm adding figures to bring various regiments further up to strength.