Rich
I don’t know if this will help you or not but I have learned the hard way about fluid volume. My first house I bought was new and I discovered after the fact that the builder had run all 3/8 copper from the pump to all the fixtures. All the time I lived there if I flushed the toilet and someone was in the shower they were left high and dry so to speak.
My next new house I made sure that it had the same size plumbing as the outlet side of the pump to as close as possible to each fixture then it was reduced to fit the fixture opening. Imagine my disappointment when I had the same water starvation problem as the previous house. In a close inspection I found a 3/8 pinch valve was used in a pipe on the water heater I replaced it with a ¾ gate valve and I can run all my fixtures without any loss of volume.
I think you are on the right track. I would be concerned that one side of the engine has a smaller feed line then the other. My concern would be that one whole side of this beast is running lean.
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