Tough to answer since we have limited info. As was stated above, though, simply continue playing intelligent, tight, ABC poker, and you should be OK at the level you're at.
Assuming you have the roll you mentioned plus continual income from your job to play 1/2, I'd be buying in for $200 and topping up anytime you get significantly below that.
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post back after around 1000 hours at live play. Then your numbers just start to meaning something.
I mean, theoretically this is correct, but in practicality, this is a silly response, you might as well tell the guy to flat out leave this site. He plays recreationally and infrequently, he stated as much in his post. He's not going to have a big sample size anytime soon.