Boost 7, Timing 6, Fuel 9.
It was previously on Boost 6, Timing 5, Fuel 8 and Boost 7, Timing 5, Fuel 9, but none of the settings has had a profound effect on the car's performance over a different setting. They all seem to be relatively the same.
Ok, so you've done the Forge DV, maybe have a look at the PCV...it is another known weakspot. Other than that, I don't really know what to suggest, I'm not an expert on these things. If you are convinced that something is wrong then I'd get it booked into a tuner so that they can run VAGCOM on the car to see if anything has been recorded in the fault memory, and maybe they can check the PCV also.