Similar understanding here. From the FCOM pages posted above:
[my wording]
1+F and real faster than S:
- use the speedbrakes at will,
- seriously think about extending the L/G
F2 and real faster than F:
- drop the wheels!
- forget about the speedbrake
The above sounds to me like an operational requirement, an advice how to get the job done quickly and effectively, using the proper tools available. Also to remove false hope that SPD with F2 well above F speed actually achieves much. That's why it is in FCOM I guess, and not in AFM.
The other line about uncorrected bank with F2+SPD stands separate, just a heads up about a F/CTL quirk.
Interestingly I've learn through the run of this thread that the FCTM G/S from above technique is F2+L/G, I had wrongly believed it is F2+L/G+SPDBRK:half.
F2+L/G+AP:off+SPDBRK:full does indeed work maybe too well.
On every of the few occasions when done, I wish to had been smarter several minutes before and avoided / never created the need for it in the first place. Decribing it as "thrilling" instead of "fun" would be my choice of words, "unsetteling", "eye widening", "massive aggressive" maybe too.
Anyone who hadn't tried yet (good): be cautious to stow them and add thrust
early enough before coming onto the desired 3 deg profile. Extremely cautious.