im putting a 6" lift on my truck this month. I have all Tuff Country parts but dont care for the 6" spacer setup. Here is what im lookin at running, a 4" Superlift coil and a 2.5" spacer. My question is about the 4" Superlift spring. How does it sit? Does is sit at a 4" lift or does it sit a bit lower than 4"? How does it hold up over time?