I'm going to measure the power supplies tomorrow (Sunday).
What could be the case (I don't know) is that you may be the only one here using these supplies for electroplating. The anodizing guys like them just fine.
The increase voltage that you see is what is dropped across the resistor, the plating doesn't see it, it will have no adverse effects. The plating only "sees" the voltage that corresponds to the current you pass through it for the resistance it has at the moment (this changes as the plating forms). This is nothing more than Ohm's Law.
The real irony here is that you will likely completely avoid many of the problems you read about here; thin plating, tarnished plating, no plating, inconsistent plating, etc. This is because resistor hassles aside; you actually have far better control of the plating current than any concoction of batteries, battery chargers, light bulbs, nichrome wires, salt water, etc.
I wouldn't be surprised if your plating is actually great, you just don't know it yet.
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