The indicated N1s suggest thrust was advanced to the full forward stops.
Having done a previous Windshear go-around, and I suspect with the Windshear escape manoeuvre in his mind the captain (or FO - we don't know if he advanced the thrust levers further as part of "set go around thrust") made an error typical of those made by a fatigued pilot in applying parts of the wrong procedure.
Hand flying the aircraft in those conditions is pretty hard work, the more so if the aircraft is light, and the supposed "coaching" might just be the FO helping the captain out by calling wind changes from the ND or previously briefed configuration points.
Once the aircraft started rocketing away, they were reacting, and probably not in a mental condition to catch up. The duration of that trim input is astonishing - I wonder if in turbulence and with flap load relief activating, he started trimming and froze his thumb on the switch while focusing on handling the aircraft.
What we really need though are the CVR transcript and the FDR data plots.