Dennis, when I look at the sanger pictures I notice that they don't have an extreme enough when retracted angle, thus they would affect the face of the wave. I bet that's why you need them all the way across the transom? I could be wrong.
My hope is that I will only put the opposite tab (from the side we are surfing) down thus pushing the nose down and also forcing a slight list. I don't think it will do a lot. Might work great, might be a waste of 300 bucks. But I bet no matter what it will help me tweak the wave a little