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I've had comments that the internal U bend (in the single 5015 duct) used to balance the air flow path length may be too restrictive. So, I have created a newer version that is in testing now that removes the internal U bend air flow. This version has a straight path for each duct. The two duct ports are 50% of the sq. mm size of the duct intact (which is the right ratio for the best positive air pressure). I have attached it for your consideration. It would be good to know if this helps, or if the duct tips are too thin walled, with a setup like yours etc.