Congrats!
Looks to me like you have a very well designed turbine for your needs.
Furling early would be preferable to late I'd think and from the power curve data you've posted it looks like the low wind performance which seems to be a big concern with most people here is excelent.
Just a quick note on safety,
One of the Cardinal rules of safety on the big turbines is if there's any possibility of things falling from the blades or tower/nacelle stay upwind of the turbine or inside the tube at all times. Ice buildup on the blades is usualy the main concern here.
Not that I think your machine would fly apart but with a new machine I'd be cautious for a while. Maybe I've just gotten too cautious from working on the large turbines where the term "minor injury" doesn't apply.
Rule #1, nobody gets hurt
Chiron
I'll get off my soapbox now