Hi There;
Yes if it is switching you do have revo software on your vehicle. I would suggest going to your nearest revo dealer to get them to set your vehicle up correctly. there is no fuelling adjustment on the 1.8T just boost and timing. the SPS isn't a boost controller its a tuning aid, the different boost and timing settings select different pre-defined boost and timing advance maps so with the correct knowledge and tooling you can set the vehicle to its optimum.
@16Klappe - you're wrong, that's all wrong.... been over this many times before. when a vehicle reverts to stock from a trial file it needs to re-adapt to stock so yes if you tested the vehicle within a hour of it switching to stock it would be down on power. BUT if you let the vehicle adapt or clear adaptation the vehicle will run stock. We do not lock anyone out of ECU's either, just most 3rd party tools that other tuners use are insufficient, as long as you can flash a FULL stock file you can be tuning a ECU that has had trial code in a matter of 10 mins. all we stop is other tuners from doing is reading out our code to stop people stealing it and if they try to flash a data area (in the case of a ME7 256k) to the ECU they will brick the ECU, so to clarify all any tuner needs to do is flash a FULL (in the case of a ME7 1MB) stock file and you will be fine.
I hope this helps!