Which EDCA parameter is used for gaming?

Hi, I know there's Best Effort, Background, Video, and voice (AC_BE,BK,VI,VO) and I am wondering which to manipulate for better performance in games (CS:GO specifically).

http://imgur.com/a/yFOTg These are what my settings are currently as default to some IEEE specification. What specific number values should I change for gaming GREATNESS?

EDIT: My router/modem combo is an ARRIS SBG6580 and I am connected via ethernet