I have had both, and the steel spring suspension rides firmer than QL did. Only in sport mode did the QL feel stiffer, but even then, it felt like it was riding on the soft part of the bump stops.
One option may be installing the larger SRT sway bars - they can be had for just a few hundred $, but what is really needed is a shock/damper stiffening. Right now there are no aftermarket replacements to switch to.
2013 White V8 Limited, 285/60/18 Terra Grapplers, 25000 miles problem free
2011 Black V8 Overland, retired at 46000 miles with QL problems