I'm in no position to advice anyone on blitz, but if you're on ICC there's a new 60min video lecture on improving on blitz, by the blitz god jorge sammour-hasbun (aka. NECF-InSchools). the guy doesn't even have a title I think, but he's just slaughtering GMs left and right in blitz. (and yeah, it's been made sure that he's legit - ICC sent a guy to physically observe him play in a tournament, and he still beat everybody.)
no easy answers there though, but one thing that stuck with me was that "the only time you should need to think is in middle game." -the beef being that you should know your openings without thinking, as well as all the endgames.
makes sense. I definitely know only an extremely small portion of my openings that well, and practically none of the endings. which is what I'm working on right now. can't hurt slow play either.