Dialog Normalization (set by metadata in the audio Bitstream) has nothing to do with audio/video sync.
It has to do with volume.
If you believe you have A/V sync error the first thing to do is make sure you are checking for that using content which is known to be correct to begin with! Far more often than most people realize, commercial content has sync error inherent in the content -- typically varying scene by scene. There's no point in delving into why this happens -- there are lots of possible reasons -- but the point is that it's simply not worth the effort to try chasing errors built into the content.
To check your sync, I recommend Disney's "WOW World of Wonder", Blu-ray. They have an excellent A/V Sync test chart on that one.
If you find you really do have sync error -- something that's not in the content in the first place -- then that could be due to a bug in your Source device or to excessive video processing time in your Display. Sometimes the best fix is to get a firmware update for Source or Display or to turn off some of the video processing "enhancements" in the Display.
If Audio is EARLY (audio ahead of video), and you decide correction in the D2v is the best thing to do, then Setup > Source Setup for each Source has a line where you can add audio sync delay. You can also adjust this for the currently selected Source by pressing and holding the "8" button on the remote until the current sync setting is displayed. Use Left/Right arrow to select a digit to change and Up/Down arrow to change that digit.