Id wind the boost down until you can get it tuned, the base map is exactly that, a base map, only good for putting it in the car, starting it and driving it to the tuners (i cant remember but i think theres even a section in the power fc manual in english with a massive warning saying do not drive the car on the base map?).
When I talked to a few places a few months ago (no-one can tune in Canberra, so talked to people in Sydney and Melbourne), the average cost was $500 for a full tune of a power fc.