I do not know if we change the LPT setting to set into the 1st interlace part even lines to background, odd lines to game, and 2nd part odd lines to background, and even lines to game then it will make positive effect on screen flashing or not.

I think there's going to be a noticeable shivering of the picture.

Don't know if such interlaced mode will be any different from the usual (non-interlaced) interleaving of pictures but in different graphics modes.

While on a small screen everything looks pretty good, on a large screen the picture still looks quite striped.

I guess it is because the resolution of the TV, it is able to show the "empty" game lines.