One of the biggest things you need to keep in mind with adjusting the torsion bars on a GM product, the bump stops are part of the suspension design. If you look underneath, the lower control arm rests on the bump stops. However, the bump stops are not a solid rubber design. They actually operate to reduce the oscillation of the suspension just like a shock.
Also, a torsion bar is a suspension spring. It's design to twist to provide spring-like action. Vehicle springs are designed to hold the vehicle up. Without getting too involved in design and application, the more you twist, the more it fatigues. Get to a point and it'll break or sag.
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