|• You're right about the octava, I used a 8-clef, but the 8 is really too small in the lay out, I realised that already, I forgot to mention.|
|• I'm playing the fast notes in the video.
A tip: don't play them too fast. It is fast, but "not that fast as you should think."
|You can try with other fingers. It's remarkable how different we all are: what fits for me, doesn't always fit for someone else:
I never succeed to play a scale like this, but this man does: https://youtu.be/3S1HK7LQY2I?t=8m23s
|Or you can try to play some places more easy:|