Similarly, Map 6 (attached below) rotates the eastern continent shown in Map 5 (last post) 180 degrees. (Look at the cross-shaped bay on the western shore of the eastern land mass in Map 5. It's upside down on the eastern shore of the eastern land map in Map 6.)
In Map 6, I finally found the shape I wanted for the central ocean. I like how the waterway arcs down through the inner sea on the western land masses, opens into the central ocean bisecting the picture plane, and sweeps out to the south west beneath the western land masses.
I also found the kinetic balance I've been seeking between the western and eastern hemispheres. While keeping this balance, the two hemispheres' land masses remain markedly different in configuration, so the image doesn't feel too symetrical to me. Connecting the eastern continental mass up to the poles also dramatically improved the overall image's flow.
(All images on this thread are copyright 2009 Edward J. Reed, all rights reserved.)