Water-cooling not my thing. But I know that if the heated air inside the rig doesn't get expelled ASAP, it will cause an increase in temp. Looking at your setup, looks like yeah, the air doesn't get expelled fast enough with so much incoming fresh air.. End up they have to find their way out which isn't the best way for ventilation.
any recommendation? if i put extra top exhaust the fresher air wont be able to reach the radiator right?
or shld i put one at the side panel to draw out?