What do you think a breakthrough is?
Breakthrough is something different for everyone. From what you are describing it sounds like you had one. Only you can answer this.
I think you had a breakthrough and just have placed this word "Breakthrough" on a pedestal. It is just a word. Go back for another experience and then you will have something to compare it to I guess. It sounds like your slowly increasing dosages are working out good for you. Just keep going and let us know when you arrive at the breakthrough you are seeking.
You stated "HOLY CRAP,OMG, WHAT JUST HAPPENED?". To me that is all that needs to be said. You broke through.
"In the universe there is an immeasurable, indescribable force which shamans call intent, and absolutely everything that exists in the entire cosmos is attached to intent by a connecting link." ~Carlos Castaneda