Similar to what I experience. Immediately after I'm done inhaling I have intense visuals where everything breaks down and looks like a rapidly mutating organism but then there is usually this shorty period that I don't remember and suddenly I am in some place in infinity. It's strange because I had a changa trip that I considered breakthrough but I remember coming to after the brief blackout and before I was aware of myself and what was happening (credentials for breakthrough in my opinion) I was looking around the room and staring at my brother trying to figure out who he was. There was a strong voice telling me he was my brother yet at the time I didn't have conception of self so it was quite strange. After that trip he told me I looked like I was disorientated and trying to figure out where I was. But that trip I remember the moment of self realisation, so I consider that trip as breakthrough.

Took me a while before this happened to me. Although previous trips had usually presented some feeling of entities I had never really dialogued with them. Then I was experimenting with freebase and vape temperatures. Similar start to before, intense mutating visuals followed by a brief blackout, then one particular trip I remember waking into a dome of light and being formally greeted by entities who proceeded to laugh at my mortality. Following trips usually resulted in some type of dialogue with entities.

My baseline threshold for considering a trip breakthrough is total loss of self awareness marked by vividly remembering the moment of it returning. Sounds like you have experienced this but it's really under your judgement.