I deleted my old reshade and started from scratch, keeping the colors from the vanilla version, just make them pop a bit more and I finally got that RT shader going. Combined with a little bit of MXAO, it's a BIG improvement.
So while the character was weirdly glowy and stuck out all the time, not affected by the lighting around him, the RT shader changes that. Also, light from candles affects the environment. I like it a lot, makes the game look way more coherent and natural. Quick comparison:
Look at the weapon and the dude on the ground, goes from weird floating, flat and glowing, to way more natural.