iPhone 5s Config Suggestions

[Zonulet]

So I've been messing around with the settings, but just cant seem to get them at there best. So I would like to know how you guys set them up for best performance. Recently I've been playing God of War Ghost of Sparta (cso), and it runs smooth, but if I have my setting on "Non-Buffered Rendering" its too dark! And if I put it on "Buffered Rendering" it gets all blurry (other 2 settings lag). Any tips on how I could improve it, or the best settings for you guys?