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I would think the clay tiles would reject more solar heat than the PV panels since they are lighter in color and do not conduct heat as well, but I'm no expert on the subject. I'd use landscaping to provide shade on the house, as it appears there is none at the moment.
Tracking is absolutely crucial to getting the most performance per M^2 out of a PV array. However, the pictures of the rack don't suggest a method of adjusting the vertical tilt seasonally, and they certainly don't pan east to west.
Still, I'm sure the setup is more efficient than if I were to install the same M^2 PV on a tilt and pan tracker in the Pacific NW. It seems insane to me that people install PV up here, when there would be a better return by installing it in AZ. Essentially leasing out the PV system to those that can better take advantage of it.
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