I can say although I love the B&M IQ Cyo Premium I have now I would definitely NOT recommend it for any kind of twisty riding, singletrack or otherwise. The problem with this headlamp is the sharp horizontal beam cutoff works very well when travelling forward or taking normal turns on a city street but fails to project the beam into the turn when taking sharp or windy turns.

For riding singletrack I'd be wary of any headlamp with a sharp horizontal beam cutoff which includes pretty much all StVZO headlamps since, IIRC, they require the sharp cutoff.