One Motor over another
Guys;
Think about it.
All of the aftermarket tuners more than likely buy Motors by the case/box and have no control over what they receive.
Even after tuning and testing, there is still going to be fairly wide variations in samples.
With that said.
Just because your particular Motor has been through the process of XYZ Motors, this is no guarantee that yours will be faster than your Buddies from ABC Motors. This is especially true of Stock Motors.
So don't blame the tuner, they did the best they could with what they had to work with.