I have noticed the same here on my own property in Atlantic County. The flies were only bad for about a week, it was surprising. And the ticks went away as though somebody flipped a switch, terrible one day, gone the next. They always die down in August, but this seemed especially early for here.
Another random nature observation.... The pine pollen season was remarkably short and light here, the past few years were much heavier, although I recall other light years. Seems like there is less new growth on the pines as well.
Have not really noticed any dead gypsy moths around here.