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)
It seems Ataman and Adam was right...
My water from well has too much mineral salts even after filtering. I changed watering of my Jaboticaba on rain water and replaced the 10 cm topsoil on acidic light forest soil. As result new leaves grows fast and healthy. Moreover it began bloom again and set new fruits.
My first flowering in February probably was induced by powerful LED 50 W lamp (equal 450 W regular lamp). This LED lamp gave supplementary lighting in our dark winter days and stand wery close (1 -1.5 ft) to Jaboticaba trunk. The first flower buds appeared stright opposite the lamp.
Also could act infrared radiation from the lamp.
Just a guess...