kenparry,
My comment about slow speed is based on my GR5/7 experience where I cannot think of a time where I would have used it in the way you describe because the wing was so good that the small, very brief increase in instantaneous turn rate would be more that wiped out by the subsequent loss of energy. This loss is obviously much more marked in the high speed environment which is why it was only really used in the slow speed environment where the energy bleed is proportionately much less. In the slow speed fight it would allow increased nose authority and also allowed roll and yaw control at speeds well below what would be possible in truly conventional flight.
It’s rather a moot point as a) you were very unlikely to get any air defender to venture into that slow speed environment and b) the jet can become so unstable that, unless very closely monitored, a subsequent departure would make the outcome of the combat rather one sided!