after looking at some of it's autoexe values, it appears that it slyly cuts corners with Q_shader___ settings at 2 rather than 3...meaning they're set to high rather than very high. This is one difference between the mster config and mine which was a tweaked HP1.3 config
I went back last night and tweaked a few things in the MSTR config here and there so it has some stuff high, some very high and a few ultra high settings. I've basically used what I've gathered over my whole tweaking experience with this game to know what I can crank up and what I can't. Leaving shadows at 1024, POM off and vegetation draw distance at around 50~ish are the 3 big FPS tweaks I use.