Noticed that optimum altitude in A320 neo aircraft when flown it left us with a small margin between the vls and vmax not like classic A320 which gives
us a wider margin.another thing is Mach control on cruising level it seems like the thrust is a little bit lazy and don't respond quickly like the classic A320, was wondering if any similar notes have been observed by pilots?
for example below I am flying 2000 feet below optimum , imagine if I climb to optimum which is 370 where the vls and vmax margin will be significantly low.
Flying at FL350 while FMS optimum is FL370, wind inserted at both levels.
optimum is FL370