When To Try The Next Level?

[StarlightCoast]

If I play Limit games and I have $300, I can play .50/$1 according to the accepted standard of 300 big bets. When should you try $1/$2? Wait until you have $600? Try it as long as you have over $300? What if I have $400 Could I or rather should I try $1/$2 and if my roll dropped back to $300 then you drop back down. A major issue I have always had is when should you try the next level?