I don't really know. After reading the source, it didn't look like mip levels were being applied to AirLos anyhow. But yeah, the previous code capped the AirMipLevel at 30- in the interest of efficiency, I raised it to 30 (why pay for more detailed searches, when it's going to show you stuff that's not in LOS anyhow). Switching it to 1 cured the problem.
Lemme try 29... maybe it's being effected by the problems with LODBias or something equally unlikely.
I should note, again, that it all "works", but that doesn't mean it necessarily works well. I have yet to do any real stress-testing, to find out whether it's broken by other events.
<tests>
Yup, it's being effected by LODBias
