I think Greenville has won 3 state championships this decade and Eastside has won it once and been in it twice. Not bad in a crowded 3A.
It is very impressive that NW and Irmo consistently make it to the state finals but I feel as if it because there aren't as many elite teams in 4A. In 3A there is always a crowded top with Eastside, Greenville, Riverside, Mann, Daniel, BC, MB. Now they may not all be as good as NW or Irmo but all these teams are forced to battle for the shot at the title game. Makes it more difficult to consistently make it there.