I've been pretty lucky with a misting system and 2 misting fans from these guys.
I noticed the pump you're running runs at 125 PSI, the Cool-Off mid pressure pumps run 200 PSI, might be the perfect step up for you! Their high pressure pumps are like 1,000 PSI and run a 1/4, 1/2 1 and 1.4 GPM.