Do you know the rear spring rate? Are the ESPO’s the XHD version? That’s usually a 110 lb/in spring.
With the tire stagger you can certainly induce more rear roll rate than a factory car, but with a stock sized front sway bar you do want to be careful not to overdo the rear bar compared to the front.
The Hellwig bar is quite a bit larger in diameter than a factory bar, you may want to look into running Hellwig bars front and rear especially with the factory torsion bars. You can still use a lot more rate up front.