Scale fatigue

I’ve been working on the ideas shown in a video I found on youtube:

The melodic minor use is quite interesting; playing the minor a fifth away from a dominant seven chord I’d heard of (so playing E melodic minor over A7), but the other use that’s shown, where you play the seventh mode of the melodic minor over a chord that I guess is functioning as a V, is something I’d not really got under my fingers before.  However, the thing that I really like the sound of is the (admittedly fast and showy) run he uses around 9min20 over the vi chord.  One of the comments says it’s a harmonic minor, though I’m stuck on exactly what he’s up to.  If it’s the same scale he describes at 4min20, it’s just plain weird:over a F#min7#9 he plays C# B A# G F# F E D C# (descending, obviously).  Which looks like… B harmonnic minor but with added chromatic stuff.  Lots of added stuff.  Which all sounds rubbish when I play it.  There’s a real gap between reading, “Hey, play this scale over this chord!” and being able to do something interesting with it.  I think it might be time to get a couple of lessons again.