I had been running .028 on my SP534's since June with zero problems and smooth idle. Monday I pulled them and narrowed the gap to .025 just for grins and giggles. Now mine seems to hold boost better at highest boost and I may even be getting a little better mileage. This on limited amount of driving.
2012 Platinum 4X4 Ecoboost with 3.55 elocker and every option available, except max tow. Red Candy metallic , Fold A Cover tonneau, Line-X bedliner, EZ down tailgate assist. Led lights under the bed cover. Aeroforce Interceptor gauge, S&B intake, Solo catless Downpipes, SSI custom tunes.