Congrats on moving up, but how did you have $528 on 02/08/2010 and then $1500 today? That's close to winning 40 buy-ins @ $25NL across 15 days. That's pretty impressive if you were doing all of that within your bankroll and limits.

I think you should give yourself a full 10 buy-in shot, not 6 to 8. Part of the reason you want that many buy-ins is for variance but the other reason is to give you time to adjust. You may be a legitimate loser for 6 to 8 buy-ins before figuring out some key differences or concepts that put you back on the winning track. Of course if you feel like you're getting completely owned or lack all confidence, you should never play no matter how many buy-ins you have.