Tom, I always wonder about that, if maybe your OEM shocks were abnormally stiff. I run mine on "Perf" all the time, otherwise it feels really soft.
"Sport" to me feels like the FE1 suspension of my friend's '96 vette (they had a softer front spring). Which rides nice, but always felt a bit soft to me. And "Tour" reminds me of our recently departed Buick Regal.