You're on the right track with NLP. It is guaranteed to take your poker skills to a whole new level. I suggest you take the next step by
reading this book.
What happens with excellent people in any field is that they do things at the level of unconscious competence. They do their thing well but they don't know exactly how to do it. They may have read a lot of theory early in their development and would have no trouble explaining the fundamentals that was good enough to make them good at it. But at some point in their development, they made a great intuitive leap in their abilities to where they are much more than good. And, usually, they can't explain anything that happened since due to its unconscious nature. But that does not mean you can't model it and transfer it into your head.
Check out the book above. It's the latest work from one of the early key developers of NLP. It will teach you how to model any excellent practitioner's unconscious competence in a very precise manner.