I have this http://www.fallout3nexus.com/downloads/file.php?id=4189 mod and applied it to game; when I equip it I would like it to increase my gun accuracy outside of VATS. When I make a new object effect, what base effect should I use (or create) to make this happen?

Afterwards I’m going to apply this effect to the said targeter eye piece.

:edit:
I guess I can just use "increase smallguns, BigGuns and Energy weapons" base effect, but applying each with a magnitude of 20 doesn’t present any significant noticeable changes. I still see some bullets are flying inaccurately and not in a tight grouping that I would like.