Best of the 90's

I've had to do a bit of clean up lately on my Pandora profile as my top station has started to resemble a "Best of 90's Rock" soundtrack. I guess when you 'thumbs up' a couple Weezer and Smashing Pumpkin songs the Pandora algorithm thinks you'll also like any rock before 1999, even though all the other music on your station is pretty current. If only Pandora had advanced controls or a way to visually map the changes on your stations...