I would also expect it to sound a tad recessed in the lower mids or forward in the lower treble, depending on how you want to say it.
If so, what could be the reason for that? Is a possible reason that the cardioid may be a little bit too effective in that lower mid region?
I wonder what that lower region would look like in the measurements if the cardioid vents were covered, either on all sides or just the top and bottom vents. I'm obviously just curious about this, as I have no deeper technical knowledge of these things.