If you want to get really technical you can try a special trick I used on my rose mojito for awhile to tame brightness and improve seal.
You need this double sided 3mm tape
https://www.aliexpress.com/item/-/32878690067.html
You need 1 full foam cut into a flat disk (remove the back part so its just a flat circle/disk)
Then you need one more foam, either full, donut or multi hole modded.
Here's what to do:
You apply some tape around the edge of the earbud cover and remove the film to reveal both sticky sides, put the flat disk of foam over the front covering the driver area and press it down on the sticky tape on all the edge parimeter. This will secure the foam disk to the earbud.
Now you apply the final foam over the earbud. Try a full foam first, and if its too dull sounding try donut or multi hole to bring back some treble.
The result is a foam that is thicker and has more dampening to reduce treble, but isn't too bulky on the sides or back so as to cause discomfort or a bad fit.