Pete, Troy from mildrins does a fair bit of tuning at my mates work Aussie dyno and tune, He also has tuned a fair few PFC's, seems well educated with tuning...usually you can tell just by how they talk and their attitude while they are tuning. Just a thought, You could also keep it in AWD as my mate's dyno is 4WD. Brian Hester is another one who hires out the dyno, years of experience, national rep for HALTECH, but also does PFC's. He has done a fair few GTR's.
food for thought.
Ryan