After trying several shader options with my games, I decided that the best one for my 1920x1080 TV screen is BGFX with crt-geom-deluxe shader with some slightly modified settings. The settings I'm currently using are crt-geom-deluxe with delta-1-4x1-rgb.png, gamma screen output at 2.40 and shadow mask at 0.50. All other settings remain unchanged.
However, since the TV has a larger area than a laptop monitor, the resulting scanlines are quite large and they are way too dark, which darkens the game screen and makes the game to look not quite pleasant. It hurts my eyes when I'm playing at night for example.
Is there any way to reduce the amount of darkness that are applied to the scanlines, so it would not look so dark on screen?