So this is the appeal of the doubler/tripler circuits, silly as they may sound at first.
The point is not to boost the power boost the power boost the power
Actually, if the components are selected carefully, what it CAN do is add a new battery charging circuit but with higher impedance than the main one. With that circuit in action at speeds below cut-in, the WT is already loaded when the main circuit cut-in is passed. Why this matters...
To make a mechanical analogy (which isn't such an analogy in this case):
Lightly loaded joints are easily moved by vibration and conduct it to other parts. Heavily loaded joints do not, because the load and the mass damp out the motions.
Similarly, lightly loaded electrical circuits with low impedance (ie. rectifiers are off) allow transient currents to flow, but these same circuits can damp them out when currents are allowed to flow through loads (ie. rectifiers are on).
ALSO similarly, electrical circuits that have high transient currents experience mechanical vibrations, and those mechanical vibrations are objectionable if the other mechanical loads (weight, thrust and drag) are also low. That's what's happening at cut-in, too.
So that may be where the doubler/tripler circuits can help. They put an electrical load on the system where the wasn't before. Once the main circuit turns on and begins throwing up the transients, the system already has current flowing through the other circuit. I'm hopeful the mechanical loads in play can damp down the cut-in jiggles.
...and so in theory, a properly selected doubler/tripler could do two good things: increase the trickle of power at low wind speed, and add mechanical damping to the cut-in vibrations.
It's all a beautiful theory in my head... don't spoil it!