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About capacity, we use 6500mAh cells, and of course not rejected cells for sure. And the reason why we don't use 6800mAh or 7000mAh capacity? The reason is the same why Panasonic don't make cells larger than 6500mAh for hybrid car while they even can make 11Ah cells(both of us can), more capacity means shorter calender life, i have explained above this issue is about the thickness of separator, we evaluate and adjust the feature of calender life and capacity to a both accepted level, i think you could understand that if you are familiar with electric-chemistry.
At last, you mentioned that your battery is 6.8Ah capacity at 150A discharge, have you tested about it? Because i know even Panasonic can't make battery at such a high level, or even not close, that is far beyond the current ability of the world's NiMH battery technology, i can even tell many more basic concept mistakes in your judgement, i think you are misled by your "professional" supplier.
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