Improving HV regulation

[lnx64]

I know this may end up just being a lost cause, and not that big of a deal, but I want to experiment a little just to see if it can be done.

When watching movies on my 80's Samsung (I can't get the model right now but I can get the chassis number if you want, the back simply has no model number for some reason, but I would have to take it apart first), any bright flashing of course changes the picture size a little due to poor HV regulation. Can this kind of thing be improved or is it down to just a cheap design and would require far too much work to improve?