It looks like you may have some fighting currents in your setup as it stands right now.
I would put the filter intake, the filter spraybar, and the powerhead all on one side of the tank. Angle the powerhead up and across, aiming at the opposite corner, creating some surface agitation. This will help with gas exchange and loop the water through the tank, pushing detritus towards the filter intake.
I have a similar setup and struggled with C02 distribution as well as some oxygen issues. After everything was set up correctly, those problems largely disappeared.
I'm also amazed at how little dirt is spread through the tank. It all settles on one side.