Please post up how much you run your pump...I'm trying to get an idea if I'm running too much or too little, and also trying to decide how to reprogram for winter.
Shifting the runtime to nighttime seems like a good idea, because the freeze protection will kick in occasionally anyways, then of course dial back the total hours/day.
Here's what I've run thru the summer, the chemistry seemed fine...
HIGH 1, 10am-6pm (8hrs)
LOW 1, 8pm-12am (4hrs)
HIGH 2 --none
LOW 2, 4am-8am (4hrs)