Powerhead placement

There's so many possibilities...

My first suggestion to try would be to move both PHs to the back of the tank and point the outputs directly at the glass. This will allow the deflection of the flow off the glass to create indirect and more random flow patterns. Also, I'd remove the plastic flow diverters from the output. It might just be me, but I think those things are so ugly.

I've been able to create a nice random flow pattern doing this in our 90g tank with just 2 MJ 900s and our return pump outlet. Both PHs are on the back glass, one on the right points at the side glass and the other on the left at the front glass. Our return jet comes out from the back left and points towards the front center of the tank. Many people would say this is an inadequate amount of flow in our tank (in terms of gph), but it has worked very well for us and our soft corals and LPSs wave back and forth nicely, even the ones down on the sand. The sand stays algae / diatom free, too, and there aren't any noticable dead spots where detritus builds up. We don't have problems with excess detritus on the rock either, but I do use a turkey baster to stir up the little that there is when I do water changes.

I hope that helps some...