Do you get any shadows during part of the day and/or year? If so, how much shadow on a group of three panels can occur until you lose the output from that group?
Since your panels are probably much cooler than roof mounted systems, you can then probably tolerate a bit more heat gain from using a reflector. I missed how the tracking is controlled - is it real time, or is it on a timer?
Another thought: does the tracking motor typically end the day at the same angle as the beginning of the next day will need? Can you "park" the angle as steep as possible in the winter overnight to minimize snow - if you ever get snow?
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