Second this, I've been looking at the SuperCRT tool that was made by J. Kyle Pittman and I think it has the desired implementation with a glow but no fuzziness https://piratehearts.itch.io/supercrt. Would love to land closer to that look with this already really great shader.
Viewing post in Advanced CRT Shader for GameMaker comments
Hello,
The random noise in the glow can be removed by changing one line in the glow() function of the shader:
Before: vec2 texel = gold_noise(uv * 1000.0, u_random_seed) * u_glow_spread / u_game_size;
After: vec2 texel = 0.5 * u_glow_spread / u_game_size;
This should give you the result you're looking for