If you flushed them well, it should have gotten rid of the excess nutes. How often do you water? If every three or four days, then I would say skip one watering, then start them back on a lesser dose of nutes.
How I check to see if they need water is. I stick my finger as far down in the soil as I can like 2 to 3 inches and if I can't feel any moister I water them which it comes out to be ever 3rd day I water