18psi sounds mapped to me. GTIs run a peak of 1 bar and ED30s run 0.9 bar.
You can easily tell if you have VCDS by checking the Flash count in the ECU info. Factory = 0. The counter goes up 1 every time it's reflashed.
It's how dealers were rejecting warranty claims back in the day as you cannot go back to 0 again......which saw a huge rise in tuning boxes as they are invisible to the ECU.
The only way to go back to 0 is with a brand new 'virgin' ECU from VW.
Off topic I know, but just for general info