There are three basic ways to use the carb cap.
Method one, drop your bhomb just colder than you're used to, cap. Works okay, improvement but nothing drastic.
Method two, let your nail cool for a good ten seconds at least, experimenting until you find the right heat for you and your nail. My preferred method, good flavor and smoothness and improved potency.
Method three, start with your dab on a cold nail, cap it, head with a low flame on the torch until vapor just starts to exit the holes, inhale, reapplying heat as needed. Best method, but requires practice and IMO some goddamn witch craft because I cannot for the life of me get it down.
You're cosmic carb cap will not function significantly differently to the HE cap, though the HE might be better. I have a clone of the HE and have never seen Cosmics offering in person so I cannot be sure.