I have never heard any communications on Palmetto 800 that I could identify as SCFS. I monitor several towers in the Upstate. Based on what I hear from others through the grapevine, you'll hear the vast majority of their communications on their VHF repeater and regional tac frequencies as listed in the database. I have confirmed those in the upstate to be active.
That being said, I was justing thinking to myself recently that SCFS comms on their VHF frequencies has been pretty scarce lately, as compared to other Spring seasons. I'm not sure why, but it probably has more to do with when I'm listening (and not listening).