I have never seen anything like this but it looks like your convergence is OK. Can you adjust the gred, green, and blue all in both the horizontal and vertical directions? If so, your convergence output circuits are fine.
That's what I did.... anyways, the set is 9 years old and I don't think it's worth putting to much money or time into it...Raster position needs to be done according to the manual, then convergence adjusted from there.
I live near Montreal, Quebec, in Canadasure if you deliver it. lol. what state are you in? what town.