That's a Panasonic tube so we can't be sure the value of C97 is correct for it. If you have a capacitance tester measure it and see if it has decreased a lot. Alternatively, get a few caps of increasing value and try them until the sides are as wide as the middle (a vertical bar test pattern is more helpful than in-game pictures). Try: 0.18, 0.27, 0.36, 0.47 (depending on where you buy them, the value could be in nanofarad so 180, 270, etc.). It's important that the voltage rating is the same (400V) and also the lead spacing (22.5 mm).
Hey, I think It worked, although previous capacitor was fine, I bought some mkt capacitors (Actually it needed mkp, but I made a mistake and bought mkt ones although mkt worked for testing), I soldered some posts in order to try different ones, 0,366nF and some width twiking seems to do the trick.
It still has some slite weird quirks, like for example 2-3 brigther lines at the far left but they are hardly noticeable, the result is soooo much better than before and I really thank you that you helped, you are a true wizard in this area.
The only alarming thing I noticed through testing is that with larger C97 capacitor, the capacitor is getting hotter (yes it is rated for 400v) with using pandora box vga output, but it gets like A LOT hotter when I use a vga output from a laptop or a GBS-8200 (cga to vga converter). Although if I solder it on the proper side of the chassis it is almost under tha fan so it will help.
Also I think I created a tiny bending on the sides when I was testing linearity coil setting that can't get rid of with cushion pot, I will fix it probably with some more tweeking.
But overall it I am much happier with the result than before, I can't even grasp how you knew about the specific capacitor.