I'm experiencing the same problem. Last season we did a lot better than this season so far. Weather last year was more moderate with a lot more rainfall. Not sure what the problem is, but this sustained heat, with temps in the 90's, is not helping. I'm sure the folks down south will laugh at me though. They're use to this kind of heat!
You might try picking a day that is breezy, say 10 - 15 mph predicted winds. And drift 1/16 & 1/8 oz. jigs with your favorite plastics. The wind seems to pick up their appetites and a drifting presentation is quite effective, in my opinion. Other presentations will work, as some of the southern folks, who are more experienced, can help you with. Good Luck!
"A voyage in search of knowledge need never abandon the spirit of adventure."