I've never chased a BB shell, and consequently I've installed a lot of bottom brackets in spaces that might not have been perfectly round or free of a rough thread or two. They went in straight, slowly, and with some effort, and came out and were replaced the same way. If yours is in there straight and tight now, and the cranks are spinning freely, I would recommend leaving it alone. Someday you'll need to replace it, and you can deal with any issues present then. I doubt you'll find a problem.
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