BARO is Barometric pressure, which is the actual air pressure measured by the car at the MAF sensor and is often read in PSI (Standard BARO is 14.7 PSI at sea level, lower in Denver and higher in death valley). It is not a measure of boost.
However your reader has it in Inches of Water, which I don't know the exact conversion for but is probably around 14.4 to 15.0 psi.
For all intents and purposes this reading is meaningless in regards to your problem.
Your best bet is to go back to the dealership and have them perform the bulletin that measures the wastegate rod play, it's probably excessive. When the shaft gets to much play it can bind occasionally, preventing proper boost control allowing the turbo to make more or less boost than commanded. The ECM is constantly monitoring commanded boost and actual boost pressure and if the 2 deviate to much it'll throw a code.
