Reggae, have you ever messed around with your ebb and flow? I ask because a friend of mine turned me onto creating a hybrid ebb & flow/swc and I love the results..
What I do is put an airstone under each net pot when the pumps kick on the airstones kick on, eventually when theres a large root mass i put a riser in, keep the table flooded with about an inch and a half of water (i had to cut a riser in half to get the desired water level) and still flood it every few hours to cycle the water/nutes.. I have really liked the results..