E39A Struggling for power?

Hey Guys,

First post here so just after some advice. Been doing some E39A ECU's for a while now, but came across a software variation I've never seen before. I seemed to struggle to make extra power and torque on it and couldn't understand why. Anyone ever had this? I lost boost down low from the standard map and no matter what I tried I couldn't get the boost back down low. Flashed it back to stock and it came back. I spent the whole day trying different things with the two torque limiters on it with EFI Live, but just couldn't get the power back.

Anyone ever had this and know a solution?

Thanks in advance.

Post tune file, I'll see if I see anything.