Good luck, content_ed. I've done a lot of experimenting with adding subdomains and changing domains, and my experience has lead me to conclude that Panda is simply recalculated much less frequently than the other updates. Changing domains properly can have a positive effect within hours, but my sites have always eventually gone back to being Pandalized.
None of the other site improvements I've made have had any effect, so having a few weeks of high traffic here and there have been nice, even though it didn't last.
Hopefully, your mileage WILL vary.