The quadrature was different between the NLOAD case and the Pressure element case. If I turned off follower and set the quadrature to 4 x 4 the answers agreed which verifies that the pressure element is working for the dead load case. The answers are slightly different for the follower case. Thus, the problem should now be o.k. -- seems one should use the higher quadrature as it made the plot better too. May not be too meaningful though as the mesh is very crude.
Good work in extending the element to work in ver8.4!