[bbartlog]

Looking at your blog, I'd say the first thing you should brush up on is BR management. You built your BR up to $900 and then sat down in a $30/60 game. 15BB is *not* a reasonable BR no matter how good you are. Similarly you're talking about playing $2/4 with a $160 BR, which is marginally less suicidal but still carries a very high risk of ruin.
I realize of course that playing 0.50/1.00 may seem boring after your fling at $30/60, but if you're serious about winning and not just playing for the gambler's rush then that's the level you should be playing at.

I have no additional advice except to note that a decent bankroll for 3/6 would be $1200 (more if you're conservative about these things), not $160 which is what you indicated you had left.