I am back on a Borderlands kick and am at a loss for an "optimized" play though sequence of play though 1 & 2 of the core game and the 3 expansions (Zombie Island, General Knoxx and Claptrap's).

I know that play through 2.5 (meeting the evil in a can a second time) makes all the mobs your level for the rest of the core game. Does that also bump play though 2 mobs in the DLC to your level if you haven't completed them? How about DLC play though 1 mobs?

There seems to be way more content than leveling available and I rather avoid facerolling as much as possible.