I think the raster is tilted. Unless the tilt is especially large it can be hard to see unless you have a straight edge near the end of the screen, which is what you have on the right side in the first picture and on the left on the second picture. If the image is extending beyond the bezel (which is a normal occurrence) it can be hard to see the tilt. It is probably there on the later systems as well, but since they tend to use the entire visible area you have a harder time noticing. I would be willing to bet that this tilt goes away if you point the back of the tube west.
Also, if you poke around the service menu be very careful. Write down the original settings so you can change them back if necessary and don't change anything if you don't know what you are doing. The wrong adjustment can cause permanent damage. Whatever you do; do
NOT perform a factory rest.
Here is the service manual:
http://diagramasde.com/diagramas/otr...17_ch_ba-5.pdf
What you need starts on page 16.
There are probably not many professionals left who really know what they are doing when it comes to CRTs.