I am not qualified to comment on the subtle advanced stuff you want.
But I noticed you are not racking with elbows high, even though you get elbows nice and high when you prepare to jerk.
Did you widen grip when you prepare to jerk? Have you tried to pull using the same grip width? Technically it should be easier to rack with elbows higher than in your jerk position as hands/fingers can be open and loose.
The other thing was that you are coming onto your toes when you are driving you jerks. If you push through the heels you will feel a MASSIVE boost in power transfer.