Anduncan, congrats on making the cut (CDC positive). I had almost the exact results as you except our bands 34 and 39 are switched making mine only IGenex positive because the CDC doesn't count band 34 because of the Lyme vaccine (which I never had).
My LLMD says that bands 31 and 34 would be quadruple positive if you had the vaccine so automatically throwing those 2 bands out sounds pretty dumb to me. It's obvious they want as little people positive as possible.
Fauxpainter, IgM is recent infection and IgG is past but a lot of times you can stay IgM positive for many years like in my case as I happen to know when I was bit. It makes determining how recent you were bit tough to figure out so basically you have to just go by symptoms.