With Verbatim DVD+R 16x [MCC 004];
CopyToDVD burned the disc at 4x though it was readable in every drive.
Nero Express took 8:21 to burn even though it had slightly less data than what was the full capacity of the disc, the resulting disc was readable in every drive.
Nero CD/DVD Speed took only 6:12 for the create test disk writing it at 16x, disc was not readable in any drive it also dropped to 10x at the very end.
Second attempt with Nero CD/DVD Speed the disc burned at 4x instead of 16x, it was readable in the other drives.
Verbatim DVD-R 16x [MCC 03RG20];
The 1625 only supports this media at 8x but resulting disc was readable in every drive.
RiData DVD+R 16x [CMC MAG M01];
The 1625 would only burn this media at 4x despite it saying it supports it at 16x, the disc was readable in every drive.
So yeah something odd going on with the 16x media
[Everything that is 8x rated seem to burn fine with the 1625 drive and all the 16x media I have burns fine with the 1620 at 16x]