Yeah, I know the chart, this info was disseminated in an article by somebody with an engineering degree....& should know more than I do about it about 35 or so years ago... @PST
Some of the bars do have kind of a spiral pattern to them, but my understanding is that’s a “finish” because they’re ground to the correct diameter after forging. I talked to a Firm Feel about custom bars once and they said they’d have to be ground down from their next size up, hence the cost.
I know @autoxcuda has been running 1.14” MP bars that have the same part number on both sides for a very long time now. Anecdotal of course but if there was an issue I’m sure he’d have run into it by now.