What is your lighting...I see some large tanks use extra tilted leds ( egRadion)or t5 for lighting the undersides of the rock work/corals which is shadowed. Also for flow, do you think that is enough with 4 mp60/40s? check out the reef builders guy jake who uses powerful vectra pumps and wave boxes..
https://reefbuilders.com/2020/05/14/...flow-aquarium/. ..he claims strong flow that is directional is more important than random flow (which is good for moving the poop to desired area for suction).