I would say that classifying certain aspects of DMT trips isn't as necessary as it may seem. Some users tend to focus specific phrases or words, such as "entities", "hyperslap", "Waiting Room", "Ego Death", etc. that give you an idea of something that is happening. These kinds of words and phrases are helpful for understanding, but they are not isolated exact concepts that are going to be the same from person to person. Even the "Presence of an entity" can be a very dynamic experience, though one might think of it as a binary proposition (experiencing the presence of an entity, or not experiencing the presence of an entity).
So if you want to call what you experienced "Being in the waiting room," or a "hyperslap", you sure can. But the difference between "being in the waiting room" and "breaking through" isn't going to be derived from anything other than your DMT dose. A full breakthrough dose is so immersive that you won't be questioning whether or not you made it all the way.
Also, the lack of a good trip doesn't mean it's a bad trip or a hyperslap. Entering into a neutral space that has qualities of nothingness isn't necessarily bad if you ask me, and the occurrence of a neutral or empty trip is common on the spectrum of DMT possibilities.
Either way, I would say that you don't have much to worry about in regard to the experience you described. Safe travels!
"It was altruism, not violence or force, which associated our higher cortex. Our intent is to awaken that memory." - Indigo