Neat tank, going to get crowded soon.
I point my returns towards the surface. That and air stones provide agitation. I then have my power heads directed down to push waste to the overflows.
You could do something similar in your tank and push solids towards your canister intake with the power head. Your HOB will break the surface for oxygen exchange but I have begun to really like the air stones of late, they pull stuff off the bottom to get filtered out and provide oxygenation