Thank you for your reply.
To make it not so easy with my problem.
I have made quality scans of my best M-DISC BR-R 25GB Milleniata disc burned with a BDR-X213.
MID: MILLENMR1 (000)
BDR-X213 (1.04) (QUALITY MODE)
OPC = Yes
@4x
As you can see, the results are at a similar and more sensible level for the three scans.
So here we can confidently conclude that the disc is recorded very correctly.
It seems that the LG drive is not as sensitive as the iHBS recorders.
I therefore repeat the question:
Can we have trust in the results from WH16NS48 ? 