Are you filling everything or listing the boat? Sounds like you don't have enough weight. I have an S21, I believe the bottom of my boat is the same length and shape as yours (maybe the front is a little different because mine is a pickle fork) and I list my boat for the best wave.
I fill both quick fills, fill surf side PNP (1000lb sumo sacks fit perfectly), 150lbs of lead under surf side PNP, then I spread 350lbs of lead under surf side seats. I set the stinger plate to roughly 25% and about 3-4 clicks on the quick surf.
Sometimes when it's just my wife and kids the above setup is lacking a little, with a larger crew this setup puts out a mackin wave for a 21' boat, my buddy has an ri 237 and he loves my wave (maybe he's just being nice haha).