Alex!
I have the same problem. You irrigate with city water? If yes, you must forget it. I used
earlier pure city water, but it didn't work. Always had chlorosis problem with my plants (citrus trees and coffee was the worst) So, i used for few years "managed" city water. I'll tell you how i make it. First leave the water stand for a day. The chlorine is removed. Second I use vinegar essence for pickling. For 10 liter of water 1 teaspoon vinegar essence. From ph 7,5 to pH 6,8 decreases. And I use always a small amount of general fertilizer + small amount chelated Fe.
I know rainwater would be the best, but unfortunately there is no chance. I almost forgot: if you can't use vinegar essence, you can substitute citric acid. In this case for 10 liter of water 10 gramm citric acid.
This method worked my citrus trees and another acid soil loving plants(coffee, orangeberry)