Extract directly from the A320 Flight Crew Training manual :
Suplementary Information
Adverse Weather
TAKE-OFF
For takeoff in high turbulence, the flight crew must wait for the target speed +20 kt (limited to VFE-5)
before retracting the slats/flaps (e.g. the flight crew must wait for F+20 kt before setting Flaps 1).
No girlish behaviour here
The book (FCTM) says you MUST fly this way, but doesn't look like some pilots are aware of this and only fly by the FCOM SOP section (where it says flaps retracted at F/S speed).
I also wasn't aware of this (FCTM procedure) until now
Definitetly worth discussion I say.
