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How about rather than mounting the pump lower, mount the pump at the top of the skimmer and run the outlet straignt down into the skimmer like a downdraft tube. It seems pumps like this do a better job at pushing water than sucking air.
Also, for the impeller, have you considered a mix of two or three blades to help with the actual flow and pressure, and then the needles around that to shred?
The other option is the "Aquamedic" option. Instead of a flat disk with a bunch of parallel pins that cuts down the flow, a radial pin arrangement allows for better application of force on the water.
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