If the tree has a happy and moist root system in warm weather half the battle is won.
Continue adding clay around the drip line of the tree and the more the better--then wash the clay down into the subsoil with a strong hose stream.
If available add several wheelbarrows of clay twice a year till the plant looks happy, By doing that chore its likely the clay will provide sufficient micronutrients that you won't have to buy expensive trace elements from retail outlets.
The current symptoms on the leaf look less like lime induced chlorosis ---where the whole leaf looks yellow--and more like a lack of zinc and manganese.
That is because the leaf veins remain green, If the whole leaf including the veins is yellow --its most likely lime induced chlorosis. Search images for this issue on the net as there lots of images to compare to what you have.
As you would be aware, strong-hot winds will damage the foliage and young fruit, so if that is an issue work on some form of windbreak that decreases airflow around the canopy and to maintain a more humid micro-atmosphere.
In Asia they usually put a paper bag around ripening fruits to protect it from bird and insect attack as well as the hot drying winds during ripening.
Search aspects of mango growing on the net including issues with fungal attract where a fungicide such as copper oxychloride is sprayed on leaves and fruits. Get the rate as accurate as possible in order not to wipe out the growing crop.
If you see a healthy tree and can chat with the owner try to find out what they did to achieve success.
