Real NZ Tauranga
I got this as freeware on the recent PCPilot magazine disk. I have ORBX NZNI. Looks great but my airplane sinks below the runway. Is there something I'm not doing correctly?
But I had the same problem as the OP - horrendous elevation issues. My solution was a little different, however. Instead of uninstalling Orbx's NZNI, I fully uninstalled RealNZ Tauranga, then installed it again "clean". (I had previously unsuccessfully tried to just reinstall it.) This time around, I made absolutely certain that the Oceania group was active in my FTX Central (it wasn't when I did the first install - that was probably my mistake). This time around, it worked perfectly, and I must say it certainly looks seriously good!
The only gripe I have is that my frame rates were pretty horrible when I was taxiing around my new-look NZTG (only getting 5-10, but improved to 20+ after I took off).