Maybe they changed the hardness settings or the lethality of the gvs for the scenario....... Can they do that?
You can change lethality with the PlaneGunLethality settings, but I'm not sure if it's possible to change only lethality for tank guns and not at the same time things like aircraft cannon.
The PlaneGunLethality settings for the Tunisia scenario (and all past scenarios that I'm aware of) are at 1.0, which is the same as in the Main Arena.
We do set the ack levels lower frequently in scenarios (controlled by the GroundAutoLethality settings), but those do not affect the lethality of manned guns, aircraft guns, or vehicle guns.
I think that any effects people are seeing that seem different are just because there is a lot of variability in the result, and any small sampling can show a lot of variability.