Front subframe sitting on bump stop ?

Your best bet for running the car that low is to use drop spindles, because your front suspension was not designed to have optimum geometry when that close to the bottom of it's travel. By using drop spindles, you can crank the torsion bars up to get to the factory specs.

Firm Feel will make you pretty much any torsion bar you want, but right now there is a pretty big gap in production and delivery on some items.

As far as getting the car to hook up, using a drag radial made a huge difference on my Mopars. I've found no downside with running them either. The work as good or better than any wide tire in the rain, but they are only effective in a moderately narrow temperature band. If they are too cold, they don't hook, and if they get too hot, they get greasy feeling. When they are in the sweet spot of temperature, they are actually pretty amazing and make my cars safe to drive on the street.