I used to have the same problem, my br management was horrible, so I decided no more deposists, that every time I lose my bankroll I would start from freerolls. And after that I started to keep track of my ROI and playing only buyins closest to the kelly criterion. I'm now up to large $24 buyin tournaments, its been 4 months since I got the starting money from a freeroll.
I recently posted the kelly criterion for different size tournaments & ROIs, here is a link to the thread.
http://forumserver.twoplustwo.com/showfl...=4#Post12583409
The only exception is that I still sometimes play $2 headsups to kill some time, when I dont have the time for a full tournament.