I did the procedure with a BA driver and 99.7% Isopropyl alcohol. It didn't work at all, the driver lost even more volume, it is said that BAs are fragile and are damaged by impacts such as when they fall to the floor, the diaphragm hits the magnets.

Do they have to be dynamic, V-shaped and ready-made?

Ty Mr. Butterfly, could you please help me first with a link to the datasheet and tech specs pdf? I'm starting to think someone was selling a mislabeled GK-31732

I have built a few pairs of IEMs using GV-32830 and this driver has an outstanding bass/sub-bass, very detailed highs, balanced sound and no annoying peak around 3khz. I have tried other combinations of RAB, GQ, GK and in the end GV was the better choice.

NVM