"CTH" does not exist in NCTH. The -3.0 base, and -5.0 aim, for psychos apply to the base (i.e., hip fire) and aimed portion of the muzzle stability calculation. When putting the modifiers together, we couldn't understand why someone who wants to fire like nuts would have a better success rate then someone who took proper time to control and aim their weapon. Thus the negative modifiers in place of the old positive one. Of course, if you think mercs like Maddog should be better shots then "average" mercs, feel free to alter these modifiers accordingly.

FYI, in OCTH, Psychos do still get their hard coded +10%.