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That's awesome. Thanks for the time and effort you took to experiment and refine the process, it makes me wish I had something rusty (and a battery charger) to try this with. Maybe I'll have to try it with an old computer power supply.
I think your observations/theories on the anode are probably correct, a more uniform current density certainly wouldn't hurt anything and rinsing the sponge and resoaking it with fresh electrolyte will eventually be necessary.
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Just a reminder: Hooda used a sponge as a workaround because the jointer was too large to put in a vat. The ideal situation is to immerse the rusty part and the anode in the electrolyte fluid.
