same here in aus. Speed brake should not be deployed in flight at radio altitudes less than 1000'. high rates of descent is one factor although it makes more buffet than drag once you are below flaps up manoevre. Probably a missed approach consideration (remember the 757 at cali). The best recovery for a vertical offset is gear down flaps 25 165 knots thrust idle which will give you about 1500 feet per min rod ( approx twice a normal profile) and allow you to raise the nose select flaps 30 or 40 just before a 1000 feet and power up to be stable.