A custom map may help, but engine mapping is a bit of a dark art. Best to find a place who specialise in engine mapping. There will probably be good stock and improved maps for the engine as I'm sure plenty of BMW folks map their v8's.
That would be my guess too!
As I mentioned earlier on in this thread, Mogs in Perth are still in its infancy, so I'm reliant on established places in the UK and/or other members to let me have that info so that I can transfer that to my Max.
