You’re welcome. Please open your own osd file (for which you have modified the amplifier powers and changed them to 10dB) and double-click on the WDM Demux 1X4. Then click on the “channels” tab and you’ll see the window depicted in screenshot named “sc1” attached. Now change the parameters as it is shown in the screenshot named “sc2” attached to my comment, and that’s it.
Cheers!