OG Utopia owners.
I got a gooey problem:
Instead of putting forth crazy money for new Utopia earpads.....and all the damn 3rd party earpads are crazy more deep than the original earpads.
I decided to be the crazy one instead:
Be silly like me and just stick on some of this:

Futuwi Air Conditioner Foam-2 Rolls, 1 Inch Wide (~25.4mm) X 3/4 Inch (~19mm) Thick, Open Cell Sponge-version AC Foam Weather Seal for Gap Blocker, Anti-Vibration, Anti-Collision (6.5ft x 2 Rolls)
https://a.co/d/03jN5xei
&
DIY Plastic Mounting Ring Base Compatible with Focal utopia clear elegia clear mg elex stellia celestee radiance
https://a.co/d/03wwi3MZ
Can even use different depths to get closer to your ear. Then play around.
I used a 3/4 Inch deep roll. Less deep than the original pads, but mimics the depth after compression of wearing the original pads.
Cherry-picked FR:
Frequency Response at several positions of shifting the headphone around the coupler. Like moving it forward so the earpads touch the back of the ears. Etc.
Using an ICP-version IEC711 coupler to make the graph. With an official B&K 5128 to power it. Only downside, is I am using an Aliexpress copycat GRAS pinnae.