For bankroll advice look at the FAQ. I hate to bring you down, but most likely you've been incredibly lucky so far. Looks like you're on the right track now. The money is at the 6-max imo, and for you, someone who craves action it looks like; that's the way to go.
Also, if you have the checking account. Get a NETeller account. It takes a while, but it's worth it. That's because once you get that, you are able to taste the sweetest plum. Bonus Whoring. That's really where it's at for a 25 level player right now. Go to
www.Bonuswhores.com and check out their bonuswhoring101. This is what i wish someone would have told me back in the day.
Final piece of advice. Stop cashing out. If you want to move up, you need to build your bankroll to where it's safe enough to take the swings of nl poker. Check the FAQ for the exact numbers. Good luck.