Have you replaced your bump stops as well? Could be a reason that you are bottoming out.
'16 Eco-Boost Premium, White, Performance Pkg, 6R80 (again), Pwr Ebony Lthr with Nether Region Cooling, Adaptive Cruise Control, Enhanced Security Pkg., Reverse Park Assist., Big Worm OTT Graphix.
2014 GT Premium 200A, Black on black , leather , 6R80, Nav, Security. Pro Cal, HT catback exhaust 12.54@112