I've just updated my post above. thanks.
We had a ***VERY**** hard block yesterday. It was actually the hardest block the pool has ever had to solve -- mostly because of the very high difficulty of BTCZ over the past few days. Smaller pools find much fewer blocks than larger pools but you get much larger payments. When the pool hits a harder block, it's much more obvious on a smaller pool -- but he same goes for when the pool gets lucky and solves blocks faster.
Over the long run, no matter whether you mine on a small pool or larger pool, you should make the same amount of coins.
No, the issue also happens to your ZenCash and Zclassic pools, balance always 0, there could be problem in your pools. I'm staying away at the moment, disappointed with 6 hours BTCZ mining lost.