A320 thrust indication question
 

Hello,
I am trying to find documentation or an explanation on how the thrust is controlled during certain phases of reduction/acceleration. I will take a CFM for an example. Let's say we are taking off with FLX, after reduction to CL mode we get a certain N1 decrease and then it accelerates as we gain speed and altitude to MAX CL N1 that we can find in FCOM chart. So to be exact, first minutes of setting CL (reduction) the N1 does not correspond to max cl N1 in the chart of FCOM. So I'm looking for any information on how (i suppose) FADEC is handling that part where initial CL n1 would be smaller than the one on chart. Climb angles are the same, take off in managed mode.
Thanks