something must of happened during the trip then, check that your dizzy is nice and tight and hasnt moved up or down, as this can alter your timing and make it drive like shit!,

Check all hoses/pipes, for air leaks on the turbo side, and fuel lines.

The sticker if on the black ecu, is the fuel ecu, the only thing which can be done to this (to my knowledge) is a fuel cut rise.

If its on the silver one, its been chipped, to allow more boost to be run, which it proberly has regarding your spec.