What about this???

[Caymanboy]

In my opinion, the 'wedges' that are on the bottom are the right idea but are the wrong size and in are in the wrong place. They should be a little thinnier and aft further, i would recommend a clamshell installed covering 1/2 the hole, creating a venturie that sucks the water out, right now with them being so far forward it is pushing the water in, the boat is not going fast enough to suck it how, too much bottom hull pressure.