Hmm, I'm finding that, above a certain speed on the F1,

Hmm, I’m finding that, above a certain speed on the F1, if I turn the steering, the torque turns the front wheel in on itself (so it over turns and the wheel ends up pointing the wrong way). Any ideas? Or has anyone come up with a new geometry that gets past this?

Moving the linkage on the servo outward (longer servo arm), or moving the linkage on the bell crank closer to center will decrease the steering sensitivity/throw.