Doing well in multiple B&Ms; Poor in one

[El_Hombre_Grande]

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sample size isn't the issue here.

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Live, its always an issue. 30 hands an hour, and you are dividing your time between 4 venues? Do some math and let me know when you've got 100 K at that casino. I suppose you could start the wondering at 10k, but the answer would still be "most likely variance."

In the meantime, look for obvious explanations --better opponents, larger rake, etc. I would take a look at some of the threads here about winrate and the "long run"; I suspect from your post you have some incorrect assumptions.