I've got a 2544 as well and found that the high-lift blades are mandatory as the mulching blades simply can't handle "real grass".
Another thing to look at is the health of the PTO-to-deck belt. If it's even a bit loose, the deck won't spin as fast as it should, which of course decreases cut power & throw. Even then, I still find the need to go slow and bungee the chute.
The current rig is just paid off and I'm seriously thinking about green iron, diesel, and PTO-powered decks.
EDIT: @RCBE: For $3,800 3 years ago I should bloody well expect a mower to reliably turn 6" grass into 2.5" grass in a single pass without worrying about moisture levels or any of the other owner's manual stuff you cited, especially since the cheap-arse Craftsman the 2544 replaced did it easily for 7-8 years until the non-serviceable tranny finally gave out. Not all of us have the time to mow 2 acres every week (the only way to keep the 1/3 cut guideline), especially if it can't be mowed unless bone dry, which is a rare occurrence in these parts.