Thank you, Tad, for posting your observations and reflections upon your meditation experience. My response has to start with I don't know what EBT focused Buddhism is.
Sadly, I cannot say that inn 50 years of Buddhist inspired meditation practice I cannot say I haver found a school of Buddhism that has even a close understanding of the 8 stages of samadhi. The closest understanding that I can recognize is with Ajhan Brahm and his luminous orb, which he calls a "kasina," which he believes is the first jhana. The problem I have with his assumption is he completely ignores all of the other observable phenomena that tends to occur leading up to the luminous orb, which I have experienced many times.
So, your comments regard verbal thinking as a stimulus of depth in meditation. First I would like to acknowledge that we who teach meditation and the Noble Eightfold Path should be aware and value that the 8th fold (samma-samadhi) is all about the skillful practice of meditation leads to an experience, and this is just not what I ever experienced in any of the schools of Buddhism I studied or practiced in. Secondly, we who teach meditation should also be willing to accept that there are many paths to samma-samadhi. So, I don't have a problem with internal verbal instructions leading you to depth in meditation.
But, we also have to understand that the first jhana is the first recognized step in depth in meditation, and it is not a fantastic experience such as having one's entire visual field being overwhelmed by a luminous sphere. So, let me refresh the conversation here with my experience of the first jhana which is simply finding the first stage of samma-samadhi: comforting, calming, a refuge. Also, we should remember that in the sutta that describes Siddhartha Gautama's night of enlightenment began with him recalling an earlier pleasant experience in meditation which he had when he was a child. So, I think everyone seeking depth in meditation should begin each meditation session by recalling a past experience with one's experience with the deepest state achieved.
We get to the second jhana by savoring and taking refuge in the calm, comfort of the first jhana. And, we are in the second jhana when our mind becomes still. And, we get to the 3rd stage of depth when we have savored the calm depth experienced when the mind becomes still, then in that stillness various charismatic phenomena begin to rise, which are often described by observing the sensation of "energy" flowing through one's body. And, we get to the timeless experience of the 4th stage of samadhi by allowing our awareness to be fully absorbed in the movement of energy through one's body. So, it seems to me you are having a genuine experience of samma-samadhi.