No, not offended at all. Just wondering the motivation. If you want to tune via torsion bar, the rear will have to be addressed as well. If you go bigger up front, you need to go bigger in the rear the same. Changing out the rubber (most likely worn out) bushings and end links to a harder polyurethane, will probably deliver what you are Looking for.
GM builds a "safety" so to speak into the handling of their vehicles. They want the car predictable and one that doesn't snap into over steer (back end breaking loose) unpredictably. You sound like a seasoned driver so tune away!