Thanks for posting the video. There's some very useful stuff in there.
I've been working on my gunnery as a result and I'm getting steadily better. Combined with flying from the FMB, I can now choose AP loadouts so I'm dealing more damage. I've even managed to consistently break wings off He-111's. Prevoiusly, I would empty the guns into a He-111 and it would fly off with lots of little holes in it.
Slightly offtopic: The video intimates that a 105mm gunsight is the perfect size to know when a Fw-190 is 100m away (10.5m wingspan touching the edge of the circle). Why did the Hurri and Spit have a 105mm gunsight when the Fw-190 wasn't in service for another year?
Surely they would have made the gunsight 99mm or so to estimate the distance for the Bf-109. Unless I'm missing something (which is highly probable...)