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If you can get video, and did not short any wires on the CRT socket to anything then your CRT is probably just fine.
The first screen shot looks good. I'll assume it is a before shot.
The other two show what is called a "neck shadow" effect which is generally caused by the yoke being too far back from the face of the CRT or a miss adjusted ion trap.
The raster also appears to have shrunken. There are often resistors and capacitors inside the rear yoke cover, and since the yoke terminal(s) shorted to ground through the chassis housing (if I'm correctly interpreting what you wrote) then it is possible that one of those resistors (not likely to be a cap, but stranger things have happened) had excessive current through it it could have changed value affecting the operation of the horizontal stage. I'd check those resistors, and the circuit driving the horizontal winding of the yoke, and probably readjust the horizontal stage afterwards.
It is possible that the short caused a temporarily stronger magnetic field from the yoke which may have partially degaussed the ion trap magnet thus weakening it's effectiveness. If you have a spare ion trap magnet you should test it on the set.....Also try taking the ion trap magnet off and flipping it 180 degrees so the side that faced the screen faces away and see if that improves things.
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