I bought nicks drop the 3/5 setup with keys coils and helpers. I have never done keys on anything before and am only familiar with nnbs truck helpers. My questions are, when doing keys i only want a 2 to 2.5" drop how do I acheive this? on the rear how much air can helpers have and hor much lift will i get out of them. I will be running a 275/55/20 at first and want a 1" or so between tire and fender. Thanks guys.