No honey, this was only for +R-DL media. -R-DL media is probed quite differently.
We don't have a Liteon 165H6S DVD RW for testing, so I don't know why CloneDVD doesn't see the -R DL media (every -R-DL capable drive I tested works, including the SONY DRU-820A with the +R-DL problem)
It would be helpful to receive a writedvd log.
To create one, make the following registry entry:
Create a DWORD Value "Debug" and set it to "1"
Now start CloneDVD and try to create the "Source Data to large" error.
Exit CloneDVD and look in its program directory. There should be a file called CloneDVD2WriteDVD.log. Attach it to the email. And don't forget to quote your CloneDVD serial number (click on the sheeps in the start screen to see it).