If you have access to tuning software, you may be able to dial in the PCM better than we can.
The advantage of our PCM however is a lot of vital tables for fueling, transmission, spark advance, even control of the engine cooling fans are much different than factory. We focus a lot on driveability improvements and refinement, and have extensive experience of the weak links in the factory coding that are not addressed by many amateur tuners.
If you have a custom tune and can provide us with the fuel injector tables and MAF tables that you used to dial in your fuel trims, we can plug those in to our PCM calibration. Keep in mind that our tunes are locked, you won't be able to read or edit them with your tuner; you can however sell the tuner and make money in the switch!