maybe this helps, or maybe it raises more questions for you...but...
I have a 46 bow. I decided to keep flow/pumps pretty simple and get a 'gyre' going. that is, my live rock has plenty of space behind it and my powerheads provide laminar flow from each bottom back corner (where placed) towards the top in the opposite back corner and hook around my rocks to the bowed front. i only run one pump at a time (other than a return pump), so my water swirls in one direction at a time....the 'gyre'. my plan is to alternate the current in each direction every few hours with the change in direction providing some randomization in addition to what I get off the rock. unfortunately, i haven't sprung for a controller to alternate the pumps just yet and i change which pump is running by hand ever day or two just to keep things interesting for my fish etc.
for your current set up, what do you see in flow patterns now? if it's pretty random etc, the extra wear on your pumps with more frequent on/off cycles may just shorten their life without any/much benefit to your inhabitants - 2 cents