If the roots of your
Wax Plant (Hoya 'Gunung Gading') were rotted, they'd be black and soggy. In my opinion, the soil and roots appear okay. The size pot you have it in looks like the perfect size but being terra cotta, it will dry out more quickly than plastic, so you'll have to adjust your watering routine accordingly to ensure that the roots are staying sufficiently moist. You don't want it to be constantly wet but you also don't want to allow the roots to stay totally dry for very long.
Potting, unpotting and potting again causes undue stress and I'd advise allowing it time to acclimate to it's new pot and soil. Give it a location of warmth, bright light but very little direct sun and high humidity. Over the next few months, your little plant will most likely be concentrating on filling the pot with roots so you probably won't notice a great deal of growth until next summer when it will probably take off!
I've never grown Hoya 'Gunung Gading' but as Cora mentioned, it's one that likes warmth and humidity.

I'm curious as to what you mean when you say that you put it into your "
humidity section". You can place the pot atop a pebble tray and keep the pebbles moist by replacing the water as it evaporates. Misting plants can cause fungal issues, especially if the air is very still with a lack of sufficient air circulation but a fan can be run on low to help move the air around.