Hi Eric,
I may be waaaaayyyyyy wrong on this, and I'm sure someone will correct me if I am, but in looking at the picture of the bottom of your Scotch Bowl, I would say it is the lighter color that you are trying to achieve when cleaning with electrolysis. It looks to me like the black that is showing is still the original seasoning and has not been removed in the cleaning process. I like to get my iron down to the light color you are showing and then do the re-seasoning. Although I am not a great fan of rough iron, the old seasoning does usually cover up a lot of roughness that is exposed when taken down to bare iron, if it's there in the first place.
I also was under the impression that electrolysis cleaning was accomplished through "line of sight". If you have one piece of iron blocking another they wont get cleaned. In my "Perry's Barrel", if I want to clean more than one piece, I try to hang them at different elevations, and part way through the process I will rotate each item a couple of times. This helps to get all parts of the iron in the "line of sight". So, I try not to put too many pieces is at once.
Hope this helps a little............anyone else have any more thoughts or ideas on this????? I'm interested in this too.
Scott........(still @ CoH)