Gotta love the bugs. My '59 was indestructible.
Seems to me that the wind direction will be somewhat obscured by the mass of the wind follower, that is sure to overshoot and oscillate to some degree. So not sure other then some 'averaging' code one could count of wind direction being anything but just a relative measurement. Same might be the case for windspeed impulses.
The wind vane does have significant momentum. That may account for the way it dances around in a gusty wind. I'm going to have an Arduino down on the ground managing it and the other sensors. I can keep a data base and play with the numbers a bit.