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You and I may be on the right track. You see a black paint, and I see black plastic skin in the mold. But whatever it is that black color is on the outside of the red. I wouldn't drive yourself crazy trying to perfect it. We've all done that. As long as you can get close, the fish won't mind.

Your title reads mineral oil, but you post reads mineral oil. If you're using mineral oil that could be the problem. Mineral oil is not recommended.Although some bait makers use it without issue. In all the years I have been pouring baits, I have only had one batch of stick baits end up bent like that. And that was before I bagged them. I never quite figured out why. The only other time I ended up with bent baits was when I made swimbaits and the tails were bent because I didn't hang them. They weren't really bent only off center. I do hang the majority of my baits while curing. And curing to me means whenever I get around to bagging them. I use zippered quart bags from Walmart, and when I bag I add worm oil,not mineral oil, mixed with whatever scent I want, right into the bag, and as you say I squish them around to make sure everybody is coated. Then sprinkle with whatever salt is close by. Could be powdered , could be table salt or kosher salt. And squish again. I have had literally hundred of bags made up this way, sometimes for a few years without issue. I'm not saying my method is the best you'll ever use, it's just what works for me, and has for a long time. Go back and shoot your baits again, making sure to mix the crap out of your plastic. Be aware of variables like temps, Pressure on the injector, are you adding hardener? After shooting consider hanging your baits to cure.. Then try the oil in the bag method. If it still happens again, Consider using a different plastic. It may take trial and error to get it fixed.

If you are referring to a ball bearing swivel. Some come with 2 split rings on each end, others come with jump rings. Depends on what you are looking to do with it.