That is a hell of a neck crank. For taller opponents one submission hold I like going for is the BJJ Footlock/Achilles Ankle Lock. Taller guys tend to forget where their feet are at (especially after fighting for upper body control on the ground), and with enough distraction you can completely make them forget about whether their legs are safe. In which case, falling onto the ankle is usually very easy.
It doesn't matter if you agree or disagree
... As long as I don't bore you and I spark a moment of thought, my goal is achieved
Queng leon queng tigre ecu tacacut, queca pa? - Pampangan Mandarigma Motto