Yeah, I have no evidence for this but I always assumed that the later it gets in the season, the less a team moves up or down? No real idea, though. However, look at the movement from two (currently) bottom tier Big Ten teams beating cupcakes yesterday:
Maryland 105, Alcorn State 65. Maryland goes from #180 --> #153.
Minnesota 101, IUPUI 65. Minnesota goes from #115 --> #97.
So those results alone pushed a home win vs. Maryland from a Quad 4 to a Quad 3 and a Big Ten Tournament (neutral) win vs. Minnesota from a Quad 3 to a Quad 2.