I also agree that more is not better. I use a Wavebox and this has done more to keep SPS healthy than any kind of powerhead. The slow-back-and-forth really keep the polyps out and grow going. Typically, I have a few other powerheads in the tank to gently/moderately move some water. In my 120, I have a wavebox with a pair of 6105s in there that go from 30 to 45%. In my 240, I have a wavebox with a pair of 6100s that go from 60-90%
The fish don't mind not being blown all over the reef too. Seriously - it is less stress on them and they are out more. The exception: I do have a clown tang that really seems to appreciate the flow, but that is about it.