So for the last couple months I’ve been playing things like the Morello Stone Killer exercise, the money beat, etc. really, REALLY slowly, with big motions. I raise my arms all the way above my head between notes. I’m usually playing the the Stone Killer about one note=20 bpm. And the money beat about 8th note=50. And I have to say, it’s improved my speed and control better than anything else I’ve ever done.