Storyboard.
Up to Expert 7, it seemed good enough to understand each step individually.  The fundamentals now understood, I m having a rough time keeping up with the concepts of what the lessons are trying to accomplish.
The classes have been excellent in showing how things are done.  But for the expert level classes, I need more focus/detail on what each video is trying to accomplish.  To explain, I watch the entire lesson to understand what the objective was.  And then, I watch again to understand the process needed to accomplish that objective.  Finally, I m ready to watch the lesson to see how everything works together.
In the end, I m re-watching each lesson several times before I m ready for the next.  I shouldn t complain.  After all, I really like your lessons.  They are really informative and fun to watch.  Much better than listening to a college professor drone on.  I just wish I didn t have to re-watch so many times for the full benefit of your classes.
Some of my college professors had solutions for this.  They made use of  storyboards , a pictorial representation (not an outline) but a picture of what is to be accomplished.  Then the picture is annotated/marked up to show what is needed to make it work.
This would be very helpful if incorporated into your video, even better, the handbook for each lesson.  I would certainly buy all those handbooks.  Then I could use it as a tool before watching, and as a reference while watching the first time.

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Reply from Alex Hedley:

Do you have an example you could share i.e. an image?
Take a course you've done and produce the storyboard, upload it to one drive or something similar and share the link.
I write most of the handbooks and happily take any suggestions for improvements.