Lesson zero should be: If Imgburn recommends a setting, do it.
Imgburn is one excellent program, it works superbly "out of the box," and is so much better than nearly every other optical media burning program available. I have used it for years and other than a couple of very minor settings changes from the program's defaults I run it as "vanilla" as possible. I always verify a burn and shut the program down after a successful burn.
And the fact that it is free makes it even better. 8)
Just getting ready to try it out. Anything I need to know about copying and burning a BD movie with Imgburn?