Notice that even with full speedbrake applied the spoilers still rise on the downgoing wing
That's quite interesting, didn't know about that.
Your great pictures eventually shed light over a little known aspect of the 737.
Thank you for your effort!
Ps: The Training manual states on page 4.17 : "The use of speedbrakes with flaps extended should be avoided, if possible.
With flaps 15 or greater, the speedbrakes should be retracted."
Cheers, LEM