the big one is most likely a megalodon or angustidens but there's not enough for a definitive ID. The middle one could be giant thresher, benedeni, or hemiprisis. The one on the right could be megalodon, bull, dusky, or angustidens. sorry i can't be more exact than that, but its very tough to ID from pix when the teeth are worn.

How was the water? I love the Edisto this time of year. No wetsuit required!