Look, what we are trying to say is the diference is so small that you shouldn't even be thinking on getting a second pump. Too much expense for the gain.
However, you have already bought the pumps, so the question you are asking relates to running parallel or series.
Several fellows here could come and answer you with a bunch of calculations of restrictions and such. Meaning, you have to check your pump's pressure curve, and your block's total pressure curve, and check wich situation would be better for you.
You have to get the highest flow possible. Try series and parallel. The one who gives you more flow is the best.
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