As has been said a number of times - dynos are a tuning tool.
I don't understand why you're asking what 'needs' to be done prior to a dyno run... as long as the car is running fine, put in fuel... put on dyno.
I have to ask - why run a higher boost than you run on the street? It won't give you a representative figure of what the car is running in street trim.
If you want a dyno sheet to say that the car makes 4000gigawatts, then just photochop it. Dynos are useful if you use the same dyno, prior to mods, then post mods, on a similar temperature / pressure day, to determine a relative increase of your mods.