Zeffy,
Just wondering.
From flaps 2 to flaps 1 below 1500 AFE, you said. I suppose an Airbus FBW. What was your flightphase i.e. what was your acceleration altitude?
You said that you deck-angle was still 18deg, I am guessing that you were still in SRS-mode (below acceleration altitude) at which point a flap retraction is NOT appropriate regardless of airspeed and acceleration.