Wow, great car, love that!

Ref boost, your down everywhere so get that peak up to nearer 1.8 bar and make sure you have over 1.5bar to 6krpm and you will do well. That may require an actuator change if the history of yours is unknown as your boost is down to stage 1 by 5000rpm so all you have gained from your stage 3 is a very brief period of extra midrange torque due to lack of boost.

Tonys advice is of course perfect... like his tea