Why might the power steering pump whine at idle and have a large difference in fluid level between engine on just above rotating parts and off overflowing even after hi line removed and blown out with air?

This tells me that the steering system (gear or Rack & Pinion) has air in the system. This is a common occurance when replacing the steering gear or R&P and the wrong powerup procedure is used, also occurs if the pump runs low allowing air to be introduced into the system.