i am not too sure it is posted b4. 
LG4163B supports only at 4x
LG is very traditional n conservative 
Plex716a 1.03 dares not aim high either
NEC3520 1.24 burns at 16x unproblematically, but PO error on the high side.
Benq 1620pro always likes 16x 
Nope, no one has posted this before. Thx raygay
How about a scan/picture of the disc and a DVDIdentifier dump with MID code block if possible. 
Unique Disc Identifier : [DVD-R:OPTODISCR016]
Disc & Book Type : [DVD-R] - [DVD-R]
Manufacturer Name : [Optodisc Technology Corp.]
Manufacturer ID : [OPTODISCR016]
Blank Disc Capacity : [2,298,496 Sectors = 4,489.3MB = 4.38GB (4.71GB)]
Recording Speeds : [1x , 2x , 4x]
[6x And Higher Might Not Always Be Detectable]
** WARNING : Some Drives Do Not Return The Entire ‘Media Code’-Block
When Dealing with Discs That Are Rated 6x And Higher.
** INFO : Hex Dump Of ‘Media Code’-Block Listed Below
** INFO : 4-Byte Header Preceding ‘Media Code’-Block Discarded
** INFO : Format 0Eh - Pre-Recorded Information In Lead-In
0000 : 01 40 c1 fd 9e d8 52 00 02 85 0d 0e 88 9a 80 00 .@…R…
0010 : 03 4f 50 54 4f 44 49 00 04 53 43 52 30 31 36 00 .OPTODI…SCR016.
0020 : 05 88 80 00 00 00 02 00 06 09 0b 14 87 78 90 00 …x…
0030 : 07 88 80 00 00 00 00 00 08 08 13 0d 11 0c 08 00 …
0040 : 09 95 07 0e 0b 78 88 00 0a a0 00 20 00 20 10 00 …x… . …
0050 : 0b 06 1a 17 86 67 85 00 0c 99 ab 3a 83 20 32 00 …g…:. 2.
0060 : 0d 00 00 d0 00 00 00 00 00 00 00 00 00 00 00 00 …
0070 : 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 …
0080 : 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 …
0090 : 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 …
00a0 : 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 …
00b0 : 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 …
00c0 : 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 …
00d0 : 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 …
00e0 : 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 …
00f0 : 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 …
[ DVD Identifier - http://DVD.Identifier.CDfreaks.com ]
From Benq they should have supported these good since they worked very close with Optodisc to get it good supported. Also Benq supports both versions of +R 16x media from Optodisc. From which one seems to be still experimental and seems to be a big question if it will be actually released on the market.
a burn on Benq1620p B7T9 at 16x
Optodisc 16x DVD-R @ 12x with BenQ DW1620Pro. 
