Besides Bigdaves question above, what was the filter pressure at 3000 RPM after priming?

Also, it is somewhat counter productive to open the filter bleeder valve when the pump is off since this allows air into the filter which then displaces the water actually making it harder to prime. You are much better off opening the valve only after the pump is turned on to prevent draining of the filter.

Silicone pool lube is the best stuff to use on the pump lid and drain plugs.