Do not use res water.

What's good for the roots is not necessarily good for the leaves.

It sounds like you're spraying them a little too often.
Plants take up nutrients through their root system and respirate through their leaves. Much like a human who drinks water on a hot day and sweats it out. They're both replacing lost water. If I'm drinking water in the rain, I don't sweat it out, I just retain the water until I have to pee.

The trick is to keep the plants uptake of nutrients at maximum capacity. If you spray them everyday you not only change the temperature of the plant but you inhibit it's respiration rate.

It is a known fact that a plant can benefit from foiler feeding (although it's debatable how much). You should consider spraying them only once a week with a very VERY light nutrient solution made specifically for foiler feeding. Additionally, I never foiler feed after the buds appear and I spray them one last time with clean (distilled) water one week prior to harvest to wash off dust or whatever.

GM