I used this process years ago on tractor restorations and it worked well. I found that the anodes needed to be directly in line with the rust being removed for the best results.
I used a stainless tank, and just set mild steel bar stock around the parts, moving their positions as required to be "line of sight" with the rust.
In your setup, rotating the part position relative to the anodes, and flipping it sideways at some point may make the process go faster.
The black just wire brushes off and leaves clean steel.
I just finished some '35 wires, but tried molasses and blasting this time.