The first time I gave 100 NL a shot my BR was only at 1200. And after a few real bad beats in just a couple of days it was at 700 and dropping. I moved back down to 50NL. I stayed there this time until I got my BR up to 2500. ( Advice I received from Paul Wolfe on FT). Again I took some real bad beats and was down around 2100. The difference this time was I knew I was playing good. And I was not playing scared. (AS I was earlier) I was convinced that it was just the fall of the cards. I built My BR up to 3000 and said if it goes below 2500 I will bring it back up to 3000. I have never looked back since that day. My rule is don't move up until I have 30 times the full buy in. And when I dip below 25 times the full buy in I move down a level and build back up. Another thing I do is work on a moth to month basis. I only cashout 40% of a profit in a given month. This helps the BR grow