Just got my seconds chocolate dalton's and I'm disappointed that they are substantially darker than I expected them to be. I would put them at borderline black (perhaps why they're seconds?) wondering what a good technique to bring out their brown would be. I'm considering, similar to you, using some lexol conditioner to strip it down a bit before buffing and polishing with AE dark brown polish. Advice appreciated.
I would use AE Cleaner / Conditioner (or Lexol is probably very similar). I would go with neutral polish as any brown would only make them darker.
I am wearing mine today. They are definitely dark brown, but mine wouldn't pass for black. I bought mine in a store so I could make sure I was good with the color. They are definitely a lot darker than the bourbons you see out there.