I don't see the issue you're referring to.
The barrel doesn't look bent as both sides meet the mainframe equally.
The barrel isn't overtightened, the areas I circled in red show the height on both sides of the rib equidistant on each side in relation to the top strap. If I were over/under tightened, the angle would be noticeable.
The rear sight, if regulated by you to be correct, seems centered. I don't see an issue. I mean, the front sight itself MIGHT be bent, but doesn't appear to be.
The post above with the lines drawn...the lines aren't straight. So that makes things appear worse.
The rotational movement of the cylinder is normal. The splatter may be unburned powder granules, not bullet fragments.
If the gun shoots well, I'd keep it. You'll play games forever with Ruger. Don't let them fool you, there are very few "technicians" at Ruger, so you won't likely get one on the phone. It'll be someone from the assembly line at best.
Moral of the story, buy older, used Rugers. Ones built back in the day of quality control BEFORE it leaves the factory. Sure it limits choices, but you won't end up with the junk they produce these days.
Good luck.