From the graph it seems like you don't practice proper bankroll management. I'm guessing you weren't properly rolled for the $5.50s when you started them, but you may be now. General rule is to have no less then 20 buy-ins (more for higher limits) for the stakes you play (i.e. you need $110 to be playing the $5.50s). But I would suggest being cautious and having more than 20. Also when you are rolled for the next limit you can take a shot at that limit, but set a stop loss, which means you will only allow your self to loose $x amount before you move back down to the lower limits.