Water pump size and over saturated pads

Just had to replace the water pump to my mastercool, now it smells like fish! I thought that bigger was better so i went from 7000gpm to 7500gpm. Could this be the problem since the pads are becoming saturated and not having a chance to evaporate? It has been more humid lately and maybe the is a coincedence? Maybe I should go to an even smaller unit (500gpm). I have the smaller mastercool. It makes sense that they need to get wet AND evaporate for proper cooling, duh! Just wanted to double check with someone who may know for sure. Thanks, Louis