Did your "fitting session" involve a pattern board and actual targets? If so, at what distances? Your guns or theirs?
What methods were employed to determine these dimensions?

Since a flat plane contacting the rib at its extremities is the standard reference point for stock measurements, it's entirely possible that two guns with identical stock measurements will shoot differently (for the same shooter) due to variations in rib pitch (the relationship between the rib and the bore centerline). Just something to keep in mind.

If no shooting was involved, it was not a fitting session, but a bull___t session and I would strongly suggest a second opinion.