When you water, is it a deep soaking? I have an Apricot tree. I put the hose into the wl, if no well, at the drip line, and turn it on to a very slow stream, and let it go for two-three hours at a time. Google the curling leaf issue, it might be lack of deep watering, or something else.
ETD: I just googled, and one cause of curling leaves is too much water, but there are other causes for curling leaves.