Like most things in BJ, it's not all about the math, but part art, act, etc.

Are you standing behind the table, staring intently at it for many rounds? If so, that's a dead giveaway. Are your lips moving as you're back counting? That's a no no.
If there are TVs in the pit, watch the TV and occasionally glance at the table to get your count. If not, pretend to be on the phone.
Learn how to recognize the cards by the pips, so you can be a good distance away and still track it. I can stand 20 ft away and count two tables simultaneously. Or pretend I'm watching one table, then sit down at an adjacent table that it wasn't obvious I was watching. And so on.

I haven't followed your posts, so don't know what your spread or betting average is. If it's low, they place is simply a sweat shop. Time to move on elsewhere.