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Are you sure it isn't just still got some air in the uptake pipe. How long has it been running. I have a blueline pump pushing 1100 gph with an over the back supply that is only 1" pvc with the same 500 1/4 inch holes and no cavitation. If you have unions and valves on both sides of the pump try and flush it. remove the return side and rig up a tube to let you run the pump with no restriction to pull any air out. Your setup of 2 pipes tee'd into one leaves a lot of place for air to get stuck on original startup.
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