A common denominator in this whole thing is the assembly location. I'd bet there is an issue with how the loader frames are aligned and tightened when installing them on the tractors. These were all assembled in either the Ohio or Florida service/assembly points after importing. It doesn't take much movement (misalignment) at a mounting point to reflect an inch or two difference at the bucket. It could be as simple as the order the bolts are tightened, if they are all tightened gradually, or how the frame is supported while assembling, to get a loader frame mounted square.
In the end, it turned out to be this simple reason that was posted months ago for the uneven loaders. This whole saga is similar to a lot of issues brought up on forums. Too often we jump to the most extreme reasons for the cause. As the old medical proverb goes... "When you hear hoofbeats, think of horses, not zebras". :thumbsup: