
Improved Camera SE disables the hand swinging animation while running from Comprehensive First Person Animation Overhaul.
I know I need to change bOverrideVanillaArmsOnMovement=1 in the improved camera SE INI file, I did that and it still didn't fix it. I also tried bFirstPersonOverhaul=1 and that didn't work either. There was also an improved camera SE mod inside the OSTIM mod, and I tried that from the INI file there too, but it didn't work. I don't know why.
edit: What was done here was wrong, at least for me. Comment
This is what needed to be done, and it worked for me: https://imgur.com/a/p2YXj1y