Graphics cards suck air in the fan
I believe there are 2 kinds of fans, the normal everyday fans and the turbine kind like you have on the cards.
The normal fans blow in every direction, but the turbines take it from one side and push it out to the other. The turbines take air from inside the case and blow it out towards where your monitors plug into.
I think in your setup you are blowing the hot air coming out back to the cards.
Put your hand where you would plug your monitor in, you will feel the hot air coming out. Or try it with a lit cigarette, and see where the smoke is being sucked in...
that's correct the setup in the picture has the table fans on the WRONG side. I have the same card design, it pulls the air in from the two red vents in the back and bunch small vents on the top, then blow the hotair out in the front where the monitor plugs are. This can be easily verified by put your hand on all sides, you will feel all the hotair coming out on the monitor plug side and nothing on the back or side. So the best cooling is to follow its wind tunnel design, blow the fan directly in the back where the air intake, and optionally put a fan on top and blow directly downward into the top vents. In the picture you are blowing the hotair coming out back into the wind tunnel.