Great video! Thanks very much.
It's always moving onto a next string that trips me up, when playing at speed. Building up a scale, one bit at a time, looks like a good idea, as well as practicing twos and threes on the same string.
I'm going to try it, in the two nasty scales in Capricho Arabe. I say nasty, because you have to play them accelerando and with a crescendo, ideally.
"There is no duty we so much underrate as the duty of being happy.
By being happy we sow anonymous benefits upon the world."
Robert Louis Stevenson