Hi Sabenaboy,
I'm not sure pitching up a 77 Ton A320 to 10° with reduced flex thrust will get you airborne.
If the SRS commands 10 degs pitch in order to maintain V2, then you will get airborne at that same pitch attitude.
The 12.5 degs is the datum to aim for to
ensure you get airborne before the fence. If the runway is very long, what is the advantage of getting airborne with the speed below V2?