#2 on your list says to me that the tires are toed-out, which would cause the car to wander on the road and not self center. Quick and dirty way to check that is to measure the distance between two known points on the tire or wheel at the front side of the tire (a tape measure will do). Say like the lip of the wheel or the center of the tire's tread. Then take the same measurement at the back side of the wheel. The distance between the same points should be a small fraction of an inch shorter in the front (toed-in). Do this with the car on the ground.

What you are describing in #3 is called Ackerman geometry. It is not adjustable. I believe the only way to change it would be to lengthen or shorten the steering arm, which, as you know, is cast in as part of the hub assembly. Badly out of spec toe adjustment might cause the scrubbing you are describing. At that point you ought to be able to just see it with your eye, unlikely that it's that bad.

Check or have the toe checked. If toe is within spec then the symptoms you are describing I think are out the bounds of what is normally adjustable. That suggests to me that some component is either badly worn out/broken or a new part is out of spec.

I second the motion to have someone competent (a race shop or highly reputable shop) align the car.

Whatever you do, do it soon.

Will
850 / Mini