I ran across this which, while not focused on Street Beast cars, provides some insights into spring rates, sway bar sizing and driving style, and how the relationships among those components should be considered - particularly when selecting spring rates and shock settings.
Ignore the advertising at the top and go to the 'Coil Spring Selection Guide' tables near the bottom. Also, please note the caution / disclaimer about using this guide for vehicles other than Superformance brand cars. For clarity, I'm providing this link for insights into the inter-relationships of the different elements and things to be considered, not as a rule book to be followed for your car, or any other for that matter.
Cobra Valley's SHOCK & SPRING Suspension UPGRADE
BTW, the information on sway bars (
Cobra Valley's R/T Street & Racing Sway Bar Package) has me curious about what exactly is on my car. I do know the adjustments on my QA1 coilovers are set about their mid-point, which would be too firm if I were to follow the Performance Unlimited guide for shock settings. OTOH, I believe my car carries more weight than Superformance cars, so a bit firmer may be in order (though it would seem mine are set much firmer).