Plymouth duster rear suspension questions

Just my $.02, I put Hotchkis rear leaves on my Duster but I was disappointed at how soft they are, I was expecting them to be quite a bit firmer. I have 275/40-18 Continentals on the rear (255-wide up front) and it's almost impossible to get the rear to come loose in a turn and the car still wants to understeer even with my Hellwig adjustable rear sway bar on the stiffest setting, I can feel the back end of the car leaning more than the front in hard cornering. That's track day stuff though, can't really notice it in spirited street driving it just sticks like glue all the time lol. 1.14" torsion bars up front btw which is part of the issue, I put those in and now I kinda need to rework everything else to make the handling balanced again.

They may be a good match for 1.03" t-bars though. My car was decently balanced when I still had the 1.0" t-bars with the Hotchkis springs but it had too much body roll when I really pushed it at the track with the grippy wide modern tires.