FLYBOYJ
"THE GREAT GAZOO"
They are so small I suspect that they were not tactically useful in normal situations. Perhaps their purpose was recovery from a dive or avoidance of Mach Tuck.
They slow the plane down, that simple. As stated several times, early jet aircraft spool up slow and do not slow down easily. The pilots notes for the aircraft describes their operations during normal flight and use during dives. Nothing is mentioned about mach tuck