Stupid question, but being these are basically like what Nervar was putting out forever, have you tried rotating the suspect ring to the next mount? I've found several times where someone took it apart at one point and bent one of the arms fore/back, or someone used the proper tool to adjust the ring, so it was no longer straight unless mounted in the correct orientation. It's a tedious 15 minutes loosening, shifting the rings, tightening, mounting, rotating, but ... meh.

Also, depending on how well-seated and fit the cotter is, the crank can have a pitch making things wobble off-center.

If you find no matter which position the rings are mounted, it still isn't straight, then get it to the best possible orientation to straight, and if you don't have the correct VAR or Park or other ring adjustment tool, use a big adjustable wrench like this except you'll want to slide the wrench until the teeth contact the back of the wrench's throat. If you have not one large enough, But you have a circular saw, you can cut a 1" slit into a 2x4 and use it in the same manner as this tool.

RJ shows the proper tool being used here: