When to move up to 2-5

[VegasRunner]

I've been making a pretty meger living (about $15 per hour) playing 1-2 NL in Vegas for about 7 months now.

My question is whether I should starting playing 2-5. I have the bankroll, but what is holding me back is knowing that I still have some areas I could improve. I don't value bet the river enough and just yesterday, I flopped top pair with AK and overplayed it...twice.

If I move up now, I risk making the same mistakes I'm making now for more money. But if I refuse to move up until I think I'm playing perfect, I probably won't ever move up.

I know there aren't really any clear cut rules about when to move up a level, but I was wondering if anyone had some general advice.

thanks.