If you want an ENBseries that isn't overdone and has almost no lag, then it's easy to configure yours so that it only uses reflections and shadows. Use this for [EFFECT]:
From there, just experiment with the settings in [REFLECTION] and [SHADOW] and find what works for you. There are also guides online that tell you what each sub-category does.
If you want normal brightness settings, set everything in [COLORCORRECTION] to 0. However, the game will have much more vivid colors if ColorSaturationDay is set to 1 or 2.