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You need to do some research on how your car is equipped. Cadillacs have an optional Electronic Level Control, which uses Air Shocks (Struts on your FWD Sedan DeVille) NOT Electronic Struts. The shocks / struts are controlled by an electronic module that pumps in / lets out air to keep the vehicle level to the limit of system capability. If your car doesn't have ELC then it has regular struts front & rear.
If it does have ELC then your putting too small tires in front lowered the front of the vehicle causing the ELC to "lower" the rear to keep the vehicle "level". That will reduce your available clearance. If you want that be my guest, but keeping too small tires is a safety hazard, and the way you describe your driving, it is not a good idea, you're going to blow a tire.
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