The Rival and TV games really don't matter much once you're out of the regular season. If you have home playoffs and your ticket prices are exorbitant it may matter slightly, and there will be a non-zero but insignificant difference in the merchandise amounts you pull the next few weeks most likely, but otherwise there's no real reason to prioritize a rivalry game or a TV game that comes any time after your last home game.
Personally, I'd save the enthusiasm for the playoffs to give the best shot you have against the #1 - even if you can't win, it'd be uncool to the teams fighting in the 2-3 spot to essentially give the #1 such a huge advantage.