What spring rates are the SS's, what does your car weigh? I haven't tested the ST's yet, so I don't know how stiff they are in comparison to everything else. I also don't have any experience with the SS's, but maybe someone else does. But based on the trends, the dampers might make the ride a little harsh. And depending on spring rates, you might not even need ST bars, the stock ones might be more than sufficient and offer better grip than any aftermarket bars.
Tim