Alright so i gathered this info when i belonged to a Clan called The_Red_Dragon. Some nice tips but mostly the info has been around awhile i was just never really into competitive gaming persay. So check this out, maybe it will help you maybe not, but certainly worth a try. First link is the clan website second is from somewhere else. Personally i dont recommend the resolution change because a bigger FOV is better and you can see enemies earlier, nor do i recommend the Digital Vibrance, it can wreak havoc on your eyes. But the mouse settings i found quite interesting, check it out  If this has helped you or you have more info lemme know! 
http://reddragonkeep.freeforums.org/tweak-pc-settings-for-competitive-game-play-...

http://www.fpsgeneral.com/news/fps-general/22785-how-to-setup-your-pc-for-compet...

yeah for those that dont use Nvidia cards, i recommend changing the contrast level's which can provide a similar experience. Digital Vibrance also takes abit more horsepower from your GPU. But hey no matter the optimizations in the world, if your happy with your machine & your old tried and true mouse then i still say, you will have better playability. All the techy benefits in the world cant make you happy, they just make some adjustments. And re-learning how to play WITH those adjustments can be hard itself. Cheers tho, glad to see people are giving it a try!