Doug,
Have you tried the OM 4 way with the Revolution nozzles? These things index a few degrees every time they fire, and would no doubt get flow into all the nooks and crannies. Not too obtrusive either.
They have a collar which floats up, then when the flow starts again, pushes the collar down, indexing the next tooth inside, and thus pivoting the nozzle several degrees.
I forget if you are using eductors on your return pump, but this could could be added to your existing return pump to direct the water more reandomly.