So where is the rubber that has this "booster" application?
Most high-end ESN rubbers, your Rasanters, Evolutions, Ryzers, Bluestorms, Rakzas... They all have factory boost and when you get them out of the package they are flat as a pancake. You glue them on your racket use them happily until you take them off 2 or 3 months later because the booster is gone and they perform mediocore. When you try to glue them back on your racket you realize they are smaller than your blade face by 1-2 centimeters in every direction. They do not have any kind of dome, no dome when new and no reverse dome when old, they just get smaller.
If you care to measure the weight new I bet it will be 3-4-5g heavier than months later. I'm sure it's not the rubber or the sponge that evaporates.
Of course, if you apply booster on them again they will regain their original size and then they will dome.
I'm sure ESN has some special chemical and maybe some other process too to achieve this but they would be stupid to disclose it.