It might be running 350 cfm per ton to reduce humidity. You can set a desired humidity target in the advanced menus, too.

Carrier's default is 350 cfm/ton on the FV4/FE4 fan coils. It is set up just fine, and should do a good job cooling and dehumidifying.

So you are aware, the fan coil can be instructed to operate at a higher airflow setting if you want more airflow. I think it's a matter of the installer selecting the "comfort" (350 cfm/ton) or "efficiency" (400 cfm/ton) airflow setting.