noticing the short term fuel trims bouncing about quite a bit, I was under the impression they should be at or close to 0% ranging from +-1%, mine go to -4.7% to +3.0% and bounce around a lot between that, even at idle its still jumping around a bit.
That's exactly how short term trims should be mate, oscillating either side of stoichiometric (Air/fuel 14.7:1) at idle. That how the ECU keeps the idle mixture perfect, by going ever so slightly lean, then ever so slighty rich and repeating. While driving short terms can move anywhere from +10/-10 or even more on ocassions. It's not an issue, just the ECU also doing it's thing to get the mixture right.
Your Long term of -7% after a long drive is perfectly normal, and would class as a healthy car rather than running rich. . Even on a brand new standard engine, you will never see 0% in day to day driving, let alone one with a load of mods like yours. Anywhere from +10/-10 is fine, and it's going to move around depending on if you are crusing on the motorway or driving around town. When it says long term, it's only long term relative to the short terms, it will still move around quite a lot, even over the course of a few mins.
As
@nd-photo.nl said, no point in carbon cleaning it as it's not a direct injection engine. If the tuner doesn't know that, then i've got to question how good the map is and how well he knows the 1.8t. If i was you i would take the car to a reputable 1.8t tuner with a dyno and get them to live map it to all the mods you've got. They'll look it over at the same time and will probably spot the issue in no time at all, With all the parts you've replaced, you should have a nice solid reliable motor if it's all set up properly.
