Hello - may I join the discussion, as I had the same problem. I found out, that this was caused due to the different elevations between P3Dv5 default and Orbx NZGS.
First I deactivated all *NZGS*.bglfiles in the NZNI folder and deactivated the elevation adjustment for NZGS in the scenery\world\scenery folder. After that I corrected the elevation within the Orbx NZSG-Scenery folder to the default elevation - and my problem was gone. Probabely this may help you also. I have attached the corrected ADEP-File - please feel free to try it. When using this new file then you have to deactive the current file (NZGS_ADEP4_FKH.bgl.off).
I think it's worth a try.
Best regards
Bernhard
When it is not working, you can easily go back to the current situation
NZGS_ADEP5_bt.bgl