I have literally no idea, i have checked everything including body parts like 50x, am i missing something?I don't understand why your car can't low to 550PP. Softer compounds ???
Anyway , the car is light enough , you can add a few ballast to compense. This is the easiest way whithout mess the balance of suspension and LSD. But it's difficult to say the best option . I would need all the numbers for this.