Both rears are same size, brand age. Both brand new tires at the right pressure and wear. No pull during acceleration, it just wanders left and right.

 

I can tell you this...as camber nears its max negative settings, you must move the toe-in accordingly.

In other words, lets say max allowable negative camber is -1.8. and you set the camber at this number. If you leave the toe-in at a median setting, the car will be unstable and eat tires on the inside.

So...if the camber is set in the middle, so should be the toe-in.

If the camber is maxed out, so should the toe be.

This goes for the front and the rear of the car.

 

I have tested this at 140+ mph.

The car is locked to the road and inspires confidence, and the tires have a good life span.

If you are high on neg-camber and lacking toe-in, you wont want to go fast, trust me.

With these settings the car will drive as intended. A car that likes to drift turns, as any car with good power to weight ratio, 50/50 balance, and RWD.

 

Bad wheel bearing???
http://www.youtube.com/watch?v=OtRNZ...eature=related

 

This happened to me after buying new tires. Tire pressure and alignment were both good. It turned out to be a defective tire. Tire rack sent me a new one and it fixed it. Try swapping out the rear wheels/tires with a friend.

 

The rear is close to the UK alignment. It's 32 total toe and -2.0 for camber. Solid as a rock at any speed for me.

I have been in a car with same feeling before. It just felt like there was no middle in the steering, and the rear was wobbly. It was fixed with new tires and UK though, so I'm stumped. I wonder if you have a bad bushing.

Has the car ever been in an accident?

 

Well, I had an accident on a rainy day, my car hydroplaned and I ended up in a pile of mud. The car did not hit a curb or anything, just slipped to the side, but I had to get a tow truck to get me out. This happened +2 years ago, the same day of the accident I had my suspension checked and aligned, it felt normal and nothing bent/damaged was found at the time. Since then, I had numerous alignments and sets of tires, but it never felt this way.

Could a problem like this lingered long enough to manifest after my last alignment?

 

When you got the flat, you didn't put the spare on the rear did you? You should put a front wheel on the back and put the spare up front. Just want to check that as doing so will have pretty significant repurcussions later on.

Seems strange that you are having this issue. You also mentioned that the first alignment didn't 'stick'...is it possible it still isn't 'sticking?' If so, there might be a deeper issue.

 

Yes, I put the spear on the front, and took the front wheel and put it on the back on my way to the tire shop.
The car needs to be aligned like every week to bring it to specs. The weird thing is that it aligns just fine, on spec, every time. I would think that a damaged component (like UCA, tie rod) would prevent a good alignment.

To the naked eye, everything 'looks' fine, there is no play, noises or broken parts. Nothing seems loose either. I think next time we need to look deeper into the issue, but I have no idea were to start.

 

You could ask them to print the alignment settings as there now, driving badly.
Just put it on the rack, mount the sensors or whatever and see what it looks like and print.
Try to put some load on the suspension with the alignment sensors on (pry bar? big screwdriver?) and see if something changes dramatically.