Scrap the blue pads altogether and stick to ceramic rings in ALL three baskets. The stock foam in the outer core is already 5 times the mechanical filtration of other cannisters. What happens is that if you restrict the water flow in the baskets the computer controled motor will cut back power to match.
I have flow meters on all of our canisters and the FX5's set up the way I told you are running a constant 750 gph. don't forget this output is through a large double outlet fed by 1" hose rather than the normal 1/2" and 3/4" stuff. The pressure SEEMS less than it really is. Your confusing speed with volume...
Hook an FX5 up to a smaller after market output nozzle and it'l blow the end of the tank off. (don't do this by the way..it's horrible for the fish and rough on the filter...that was just an example.)
The AC110 moves a third of that at best however its in a waterfall configuration so you can SEE more of the movement.