Just to be sure on something, since I am mostly on the Classic.
The amber line on the NG with double derate option moves to indicate whatever derate is selected in the FMC. That is, on a 26K engine if 22K is selected - with or without ATM - the amber line indicates the N1 value to get 22K of thrust and not 26K.
It's been too long I've been in a NG sim. Is it correct?