Sorry you got such disappointing performance from the Future Energy turbine.
I suspect it has to do with turbulence or a low tower. Those machines are really not designed as wind mills. They are basically bolting industrial fan blades to a bicycle hub motor.
I too find the ratings hard to believe, specially due to the size of the generator as compared to the high output at low rpms.
Anyway, here's a post from a fellow who got about 500 watts in reasonable winds and 1 kw during a storm. He did comment on the bad low wind performance
http://www.fieldlines.com/story/2007/5/1/14336/56487
If you can show us some pictures of your installation, I am sure some of the more experienced DIYers here will find a solution to your problem.
Good luck!
Warrior__
"Why can't Murphy's Law be used to my advantage??"