Just my 2 cents, but it looks like your noise might be coming from your sump. The unbaffled water coming out of your skimmer, the water flowing out of your fuge (far right chamber?) looks like it is falling pretty far. I would use a piece of foam like the one under the pipe in the last pic and put it around the output of the skimmer, I know that cut down on a lot of noise in my sump. Maybe something similar at the output of the fuge. If you don't have the surging, and flushing at the durso, then it is probably working fine. The mag drive pump is inherantly noisy. I have a mag 12 connected to soft tubing and can still hear it 3 rooms away when I go to bed.
Hope this helps, Gabe