Venue EV differences

I was playing around with my Excel Spreadsheet that I use to record my win/loss records and noticed something interesting and would like to know if it is just simple variance, or something else that I'm missing. So far this year, my performance has been only modest at best with an hourly win rate of $19.47 on 80 hours of play, playing small red. However, when I compare the three venues where I play the most 6D games there is a huge difference.

All games are essentially the same, 6D,H17,ds,rsa, 75-80% penn, On average I would guess that I am playing with 1-2 other players most of the time.
Casino A: 6.6 hours played, -$47.58/hour, 5/11 session wins
Casino B: 14.3 hours played, -$81.68/hour, 3/15 session wins
Casino C: 10.9 hours played, +$100.00/hour, 8/14 session wins

Casino A has the worst penn, Casino B has the best.

So is this just normal variation because the total hours are so small, or could there be something else about these venues that is affecting conditions or my play?

Too small a sample size. The better the pen, the more opportunities to increase your bets, the bigger the fluctuations.

I'll keep going back. Unfortunately, I didn't record the venue in my records last year so I don't know what the situation was then. I'll just keep going back. It does tell me to be more careful with camo and cover at Casino C.

You'll need hundreds or thousands of hours at any one venue before these numbers might make sense, and by then, there's a pretty good chance you'll get backed off, or the game will change such that you need to reset the hours tracked to zero.

The real reason to track win/loss records at specific casinos is so you have a good sense of your lifetime win. Most (and likely all) casinos have a lifetime win threshold which will result in a backoff once you've exceeded it. It's not always possible to know this magic number, but you might be able to make an educated guess. If you've pounded a place hard, there is sometimes merit to staying away from the place for a few months, and returning anonymous on a different shift. If you've taken a beating at another place and have achieved "sucker status", you can generally get away with more aggressive play until variance starts tilting in your favor.

All of these casinos are local to me, and the one with the biggest winning record is one of the closest and most convenient. You could probably guess which one. I was thinking that I should probably either stay away, try playing Spanish, or start to rathole chips on my winning, and losing sessions.

I have been keeping my sessions shorter over the last month and have been more circumspect in my betting patterns, in general following the strategy of parlaying on positive counts and reducing only on a loss on a negative count.

As for the casino with a big loss, I guess that is an opportunity waiting for me. ;-)