I try to get multiple wave makers aimed in different directions and also hitting each other's flow to really randomize the flow in the tank. However, I end up with dead spots because I also have low flow corals on the sand bed and I try not to blast them.
More wavemakers/powerheads spread out helps. Also, more random flow seems to create a little extra turbulence in the tank and allows water to move around more so less stuff can settle.
Another good practice is to blast the rocks and any dead spots with a turkey baster to keep things more suspended so they can be filtered out easier.