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The fact that your tree which you are fertilizing and watering is less impacted than trees that are not receiving supplemental water and fertilizer leads me to believe that it may indeed be a physiological issue due to moisture and/or heat stress. The native growing sycamores typically grow along stream banks and in bottomlands where the soil is rich and moist. In most landscape situations, these are not the conditions these trees normally receive.
Michael Dirr (noted woody plants expert) says that this is a "striking and impressive" tree in its native environment but "do not plant it". It "is constantly dropping leaves, twigs, and fruit". This is just the nature of the tree - especially when it isn't growing in its ideal conditions.
I would just keep on doing what you are doing with this tree but perhaps give it a little more water during dry periods or when the temperatures are high for extended periods. It doesn't seem to be affecting the overall health of the tree.