The AUMs doesn't really have a boost table. It does everything based on specified load, which is made up from many sensor readings, temp and rpm. so the reading for load comes from air mass flowing into the intake manifold.
The only way to cheat a bit more power is use a MBC and add around 300mb (max) any more and you will get a call for limp mode and throttle cut. Unless your tuner has taken the KFDLULS (MAP for Delta pressure for overboost protection ) up from 400mb to 500mb+. If he has raised this map then in theory you can cheat a bit of boot and more power.
The lambda tables which go closed loop are based on many factors, which mean you can add more boost and still runs safe fuel/air ratios.
Nick