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Hi, I agree with you that what I've done is increase the head. But also, the pump is spinning the same speed and drawing the same amount of air just drawing less water.
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This is exactly the same effect as if you had closed the valve a little more. Closing the valve also restricts the water flow, the same as raising the lift . The pump still spins at the same speed and since the valve is before the air intake; causes more air to be inducted. The increase in performance you see may be due to 1.)the skimmer is properly adjusted now or 2.)the skimmer is better broken in now.