Grapefruit / Lavender Jones (Both Auto)

Run off from the last watering was starting to get into the 1100-1200 number, and the Lavender Jones has started to show signs of leaf issues. This watering, I cranked back to just the AN Cal/Mag Xtra and Max Bud and the PPM reading of the water was 350. After runoff, the ppm has still stayed high at about 1150. I adjusted ph of the solution to 5.9, and the media runoff is now at 6.65, so the lime in the Promix HP is still doing it's job. The grapefruit has stayed absolutely 100% healthy, where the Lavender Jones is showing quite a bit of leaf disease. I've come to the conclusion that the Grapefruit is a nutes pig, where as the Lavender Jones is not a big feeder. Lux reading at the middle of the tent is about 60000, but plant coverage ranges from 35000 to 60000.