1st time Cereal Milk grow

I am trying to address this issues my plants are having. I thought the spots were due to light burn but listening to the opinions of others, I flushed with 1.5 gallons of RO water with a pH of 6.5. I tested the runoff and discovered the pH of the runoff was at 5.2. I added cal mag to 1.5 gallons of RO water and raised the pH to 7.5. I used this to finish flushing. I also added a little garden lime. This I don't think will have much of an affect as it takes so long to adjust the soil. I will keep