A follow up on this problem. Found the cam lock fitting on the suction side was not sealing real well, was not dripping but you could see air bulbs in the fluid so seal was replaced. Helped some but did not resolve all the issues. Finally realized that the control/boom valves were going off/on at about a half second rate. The tractor was not running and I could hear a strange noise. Finally discovered the master pressure option was activated on the EPro. When I turned that function off the system started working like one would expect. With a speed of 5 mph entered in the test mode I could vary the rate up/down and system would lock on and hold that rate. While I have not been back in the field to test under actual running conditions I believe it will function now as it should.