That's a great gain! Glad you are enjoying the software. I wish we had the same gas you have out here!
I will undoubtedly keep all information confidential about the shop that left your car unstartable. Don't worry.
There are some changes before 4000 RPM, but the majority of the changes are after as that's where this engine really shines. Making changes too low in the rev range often causes knocking and other issues that I don't want people to experience. The file in your car is very similar to the one in mine, and has been track tested in extreme conditions on 3 different M3's with 300F oil temperatures and 105 degree weather. So rest assured it will continue to put a smile on your face moving forward, whether cruising down the street or beating down the track.
Please post the dyno when you have a chance.