Normally I use AnyDVD to break encryption, then make an ISO of the movie when I intend to burn to dual layer disks.
I don't use any of your other programs, so I can't comment on them. But I have used DVDDecrypter and DVDShrink to make ISO's, while letting AnyDVD do the hard work of decryption. You can also make the ISO with ImgBurn + AnyDVD.
I recommend using ImgBurn to do the actual burning to the disk since it will place the layer break correctly. ImgBurn is free to use.
The blank media is very important in burning to dual layer. Verbatim is by far the most reliable, compatible dual layer media. Everything else is just a crapshoot.