I think you need to pick another tuner! but I' ll continue
Any competent mapper should be able to :
a) tell you if you already had a previous remap causing the problems. most wont even touch a car if it isnt the OEM map.
or
b) be able to log the car / read fault codes to determine whats up with it.
or
c) tell you if a dutch import is a special issue (which I dont think it is imho)
I suspect with yours its b) and you have an existing fault (be that PCV or DV or other)
Logging N75 duty cycle will quickly tell you this, but you should consider that it may be anything. (e.g fuel issue etc)
Given what youve said Id even be checking that a 'remap' was even being correctly applied.
Get it back to stock (or stock like mode) and find out whats wrong first before remapping.
How many miles on your car? any other parts replaced recently? DSG or Manual?