Use of speed brakes in flight

[HighSpeedAluminum]

Select flap 1, 210kts, speed brake & V/S 1000fpm

Not a choice for good energy management IMO.

In your scenario SPD BRK and V/S -1000 will work against each other. A/T in SPD mode (Boeing) to maintain V/S. FL CH and full boards if well above profile.