@Dubbjr
If you know that you are going to burn a dual layer disk. Use DvD Decrypter with
AnyDvD and Iso read your image. DvD Decrypter will create two files for ya. A Iso file and a Mds file. Now use Imgburn. You can go two ways here. One is that you can Iso write via the Mds file, the Mds file contains info on the layer break and will be exactly how it was on the original DvD. Two you can Iso write via the Iso and let Imgburn do it for ya.
