I have all baseline suspension in the rear. I have all the Stage 3 stuff or w/e he calls his best stuff with all the 5/8" hiems and i have his relocated uppers with all the crazy bracing. Kevin Slabey "Owner of Baseline Suspension" is the one who recommended me to run the springs I'm running now. I need to send him these videos and let him see what the car is doing so he can give me some advice.
sounds like you just need some minor adjusting and you will be good to go. here is my friends mustang with a 377 and the baby shot with all the baseline suspension.