A330 Thrust reduction altitude
A320 family:
Between mach 0.30 and mach 0.40 the Climb thrust rating increases. On an airbus fbw Flx can never be less than CLB. To cater for high flex reductions, CLB thrust is limited at low mach. Normally during flap retraction a thrust increase is noticeable as the aircraft accelerates.
I would imagine that on the 330 it must be similar.
Brgds