I do appreciate your thoughts and efforts here Steve but taking out the baffles, cutting them down & adding a back passage channel is not an option at this point. I am going to wait to do anything else until I can get all the pumps running to see what the difference might be.
I think the easiest way of balancing the 2 return side would be just a 1" pipe to join them. I can test this by using the 2 holes for the middle pumps on both ends with a few fitting and a piece of hose. Update on this to come.
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