As we fly during the second segment around V2 to V2+15kts., thus very close to Vx and Vy,combined with T/O thrust, we have our biggest rate of climb during that period.
My understanding of performance ClassA is that as you increase your second segment time, you will also increase your altitude over any obstacle further down-route, and thus always be safe.
That is where the second segment is for actually, to get you OVER the obstacle. Third segment is to increase your speed, fourth is to relieve the engines.
So we have 3 priorities here, in the following order:
1) climb to a safe altitude
2) increase speed to be more stable
3) Safe operation of the engines/ E.O. stability
After 400', the main thing to is PF. fly the plane, PNF. Memory items as quickly and accurately as possible.
After this come the secondary priorities.
A request by PF for an action for on the MCP during "memory-item time" will cause much more confusion than levelling off 200' above your acceleration altitude, which I remain is a minimum for that field.
I will gladly correct my views on this if it does appear to be a dangerous thing to do, but then we must also urgently warn the people of DBA, GMI, AB who trained me to do so.