the issue is with the map... and your not alone.
unless the map and car can be checked before and after, with logs, you are in th ehands of someone who can flash a map they have "aquired" from "somewhere" but often as not dont know anything about it, nor the vehicle brand..
eg. I had a guy pop in to me last week, offering me would you believe remaps.. lol.. I felt sorry for the guy as he's trying to earn a living, so you cant blame him for that. He had been doing it 2 months.. and flashes code he gets off a guy. He does not have the experience of whats being changed nor what to look out for. Mobile guy, like the many other out there. His other jobs included carpentry, building maintenance, and now remapping. Hmmm
Unless you can be sure of whats being put on your car with verified before/after logs, ideally on a dyno, you are blind as to their workmanship. They wont have any idea either truth be known more than likely, else they would'nt be flashing cars with stock fueling and double stock boost..!!!!