Hello Ron,
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strictly vinegar, Kai. as for the pattern itself, i don't think i can get it better than that. just to know that it's twistcore is good enough, lol. personally, i don't like when the FeCl is used as an etching agent since it gives that burnt look...
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I fully agree on the aesthetics and prefer vinegar myself. However, ferric chloride gives a stronger contrast and often more crisp lines for documentation/analysis: just go for a quick etch, take pics, and wash several times in diluted vinegar; after a quick repolish, hot vinegar gives the preferred final etch for storage.
There seem to be a few remaining patches of stubborn rust which I'd tackle first for safe long-term storage.
Regards,
Kai