2-4NL, will i ever establish myself at this limit??

[wtfsvi]

There's nothing wrong with using the money that exceeds 20 buyins for NL$200 to shoot at NL$400. It's your own conciderations about risk/reward that decide these things, not any one else's. If some people want to be close to certain they won't go broke, that's fine. If others (like me) can accept a higher risk, that's fine too. (And I'd say your bankroll management sounds pretty low risk if you're beating the game at a decent rate.)