I'd say clear them and see how long they come back (if at all). Mine occasionally pops up some random codes, which I clear then never see again. Some of these may be spurious, I've heard of other 1.8Ts do the same.
There's a good variety of codes there but I've heard of low battery voltage (the 18010 one) causing other strange codes. Also you had a MAF code there, possible that that's caused some of the other boost related ones too.
TBH the amount of work you've done on the car, test runs with bits and pieces in temporary setups etc. I'd expect most of these not to come back after clearing them, give it a shot and see.
There's a good variety of codes there but I've heard of low battery voltage (the 18010 one) causing other strange codes. Also you had a MAF code there, possible that that's caused some of the other boost related ones too.
TBH the amount of work you've done on the car, test runs with bits and pieces in temporary setups etc. I'd expect most of these not to come back after clearing them, give it a shot and see.