Well, I don’t know what to tell you. The QA1 arms are designed to give you a proper alignment for radial tires. Which means, they are designed to give slightly negative camber because that’s what radial tires are supposed to have. So, if you’re getting negative camber they’re literally doing what they were designed to do, and the “good” is having the proper alignment for the tires you’re running.
You should not be setting 0 or positive camber with radial tires. And you can barely see a 1/2 degree of camber I either direction anyway. They really only start to look cambered when you get close to 1 degree. And regardless, you should be more concerned with your car having a proper alignment and handling than what the tires look like with a very small amount of negative camber.
Switching to large ball joint UCA’s will change nothing by itself, that’s not causing your problem. If you switched back to factory UCA’s it might help, but again that’s because they were designed for bias ply tire alignment specs. Which will give you a squirrelly feeling if used with radial tires, because they’re the wrong specs.
Saying that ride height is “where it needs to be” says nothing about where it actually IS, so, not helpful in trying to diagnose a possible suspension geometry problem.
The frame could be bent and still have the K bolt in place, one doesn’t exclude the other. But I’m more inclined to think the “problem” is that you’re trying to set the wrong alignment specs for the parts that you’re using.
