You need to contact Lite-On to ask them to change the firmware. Currently the lowest speed possible in that firmware version is 4x.
I 22:40:36 Destination Device: [0:1:0] ATAPI DVD A DH20A3P XY13 (E:) (ATA)
I 22:40:36 Destination Media Type: DVD+R DL (Disc ID: UMEDISC-DL1-64) (Speeds: 4x, 6x, 8x)
I 22:40:36 Destination Media Sectors: 4,173,824
I 22:40:36 Write Mode: DVD
I 22:40:36 Write Type: DAO
I 22:40:36 Write Speed: 2.4x
I 22:40:36 Link Size: Auto
I 22:40:36 Lock Volume: Yes
I 22:40:36 Test Mode: No
I 22:40:36 OPC: No
I 22:40:36 BURN-Proof: Enabled
W 22:40:36 Write Speed Miscompare! - Wanted: 3,324 KB/s (2.4x), Got: 5,540 KB/s (4x)
Aone used to have the Ritek media code before. They changed it to the Umedisc code some months ago. That media code is a bit new and my guess it that it's not very good implemented in the write strategy of the firmware. Try the other speed - 6x and 8x and if they also fail - try with a bit "older" media code/another brand of discs or get a burner that supports that media code better.