A good sample size is several tens of thousands of hands... i have 5000 hands logged at .5/1 at 7 BB/100 and i KNOW that this isnt sustainable, which justifies my answer.

You know when to move up limits when you have 300 BB saved up for the next limitand have been soundly beating the limit you were previously playing at.

Judging by your stats, I say you are ready to move up limits since the level of play at the next level doesn't change very much at micro limits