if you want to reduce power in higher winds, there are two choices,... or a combination of the two.
1) lower feedline resistance in higher wind to stall blades more when you want to.
2) make sure your side furling is working properly (it seems like it isnt if you arent seeing decreased output, and rotor still runs into the wind).
to fix the furling issue, you may want to add length to the tail boom/fin to effectively get it out of the wash from behind the spinning rotor. try adding length, but it would work better if you can add length and height, as to allow the tail to remain higher than the rotor sweep most of the time. Simply put, you need more, -less disturbed air- to make it to your tail.
the feedline resistance issue can be solved with relays if you want to try that (and you have an inverter or CC with aux contacts). if you slow the rotor down in higher winds, your furling will work better. everything is a trade off.
Personally, Id try decreasing resistance in higher wind and seeing how it responds (because that stuff is easy to do on the ground without tilting the tower down). after you get a handle on how that works, you can try playing with tail boom length.
RoyR