recovery from nutrient lock out

Hey all. I have some plants in a flowering room and a mother in a vegetative room. About two weeks ago, the flowering plants began to yellow in their lower leaves. The mother in the vegetative room followed suit. Both groups of plants began to show evidence of nutrient deficiency. After testing the run off, I noticed the PH was roughly 6.0 for all the plants. I flushed the plants and gave them a half strength nutrient solution.

It's been two days and I haven't seen real improvement. I'm thinking of increasing the dosage, and feeding them again their next watering(instead of feeding them every other watering). Is this a bad idea?

What did you flush your plants with? What was the final pH of the runoff after the flushing?

flushed with water, about 3 gallons per pot(each pot is 1 gallon), PH of 7.5, now their PH run off ranges between 6.5 and 6.8 depending on the plant.