Well, it turns out the mass polishing using vibratory tumblers is definitely more of an art than science. There has been few steps forward and many-many setbacks. I recently tried some new media (little plastic triangles) and have been slowly edging forward. Here are the results from the last few attempts.
I was able to overcome the pitting problems associated with the round media and too many parts in the tumbler. Now, I finally getting a smooth finish surface, but still have a little ways to go on achieving the finish. Another 6-8 hours with the plastic media should be enough to progress back to the white ceramic media to hopefully even out the surface and have it be ready for etching and clear anodizing.