I actually noticed a while back that even though I've never had dandruff per se that getting some head & shoulders and just using it once a week keeps my scalp happy in general, because for me the variations in temperature this time of year do wacky crap to my skin/scalp's balance (It's cold and dry, no wait it's warm and moist, no wait it's warm and dry, now it's cold and moist, ARRRGH!) You might just try that. Mix in a day where you swap out your normal stuff for the head & shoulders variety that matches your normal stuff and see if that helps.

Also, for what it's worth I've never noticed anything (and didn't see anything when I saw you at Pentagon City the other day).