Erik, thanks for the video! I watched the whole thing (and took notes!), so I also have no life!
The only question I have right now is about the case you had at 18:54. You are describing how to use keyhole to solve the FL slot using D L' U' L D'. However, the edge that belongs in FL was in FL only flipped. You could use a keyhole concept to solve two pairs at once (like you showed once earlier in the video) by doing: D y' U' R U R' U y L' U' L D'
That case has two cube rotations, which is not preferable, so I tried using something more in line with what you taught in the video to do: D L' U' L y' R' F' R U R U' R' F D' but this takes 13 moves to do and is not all RU or LU.
Would you have any special trick to also use keyhole concepts to solve both pairs at once quickly? Or is it not worth it? I look specifically for things like that during my F2L, so if I had that during a solve I would have done D y' U' R U R' U y L' U' L D' and just done the two cube rotations.
Is this not a good idea to do in this specific case because it is at an awkward angle?
Chris