mix
Although you didn't state it explicitly it sounds like your running water only. I would suggest you go to a 50/50 mix of water methanol for your spray mix. In high humidity environments like yours, you will probably need the alcohol to get the effect your looking for. Some of the Buick GN folks run even higher percentages of alcohol with good success.
I personally do not like the windshield washer fluid but many get along just fine with it. When I used it on an intercooler sprayer I had never ending problems with nozzle clogging so choose not to use it. (they were very fine mist nozzles FWIW)
Larry
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