Finally got this game to run as it was supposed to.
The solution makes no sense though.
I reinstalled game, let it update etc...
Copied my saved games.
Tested.
Vats drops to 1 fps.
Inserted dll fix.
Still no change vats drops to 1 fps.
Went to CCC.
Set all CCC settings to lowest possible. (CCC - 3D Graphics - All)
Exited game.
Went to CCC again.
Tested game. Game looks crap but Vats works fine!
Went to (CCC - 3D Graphics - All) once more.
Put "Texture Filtering" and "Mipmap Details" on maximum high. Left other settings as they were.
Tested game - now it looks great and I get no fps drops when using VATS.
I told you it makes no sense....
I just hope this holds..
And, I think probably this issue was caused from me updating to 10.10e (perhaps not the driver as such but the resulting 3D settings upon installing it?) and not from the game or the 10th November patch itself.