Yes. These types of attempts are a way forward.
I'd like to see time domain stuff (square wave edges, impulse response, CSD) also.
I think there are closed headphones around now that beat a lot of open ones.
Impedance graph wiggles from problems around drivers goes up to 3kHz in my experience.
Sometimes the wiggles come from designers putting pressure on the driver to make it flatter in some regions. IOW, acoustic compensations to control the natural...