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1) with regard to convergence - this is a separate issue. You need to go through the adjustment procedure. For this you need a test pattern and the service info that gives the procedure - but you should be able to improve it.
2) With regard to the color, I think we have reached the limit of what can be diagnosed remotely with the sources you have. You don't have the experience to describe what's going on, and if you did, you wouldn't need us. As others have said, the evidence so far is inconclusive.
If you can get a color bar test pattern and a gray scale pattern to view, that might help diagnose if it's CRT, tracking adjustment, color demod chip or ???
Where are you located (roughly)? Anywhere near someone who could come out and look at it with you?
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