When you increase your collector size your output is going to go up! I was just looking at a chart in Home Power magazine on the power output of a number of wind turbines and if you make the blades two feet longer (and size the generator to handle the increase), I compared to turbines of the same company, Proven and with an 8.4' rotor and a 12mph wind (decent, average wind speed) you see an annual output of 1,488kwh bump it up to an 11.1' rotor at the same wind speed and you see an annual output of 5,004kwh per year.
The "wind lens" just increases the collection area, just like adding reflectors to solar.
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