Hi AYP,
You are welcome! I'm glad you found the right lesson for the technique.
1. The main difference between Deep Meditation and Samyama deals with meaning:
Meditation: no meaning involved, just repeat the mantra.
Samyama: pick up the sutra once very faintly mentally, and let it be associated with meaning, then let it fade into silence.
Remember, this is only a very condensed interpretation, and not complete. Refer to the lessons for a complete description.
2. In sutra 9 you use the whole sentence: "Akasha – Lightness of Air".
3. Since meaning is important in Samyama, if a certain word gives you a meaning that seems wrong to you, then you can choose a word that associates it with the meaning that feels right for you. For example, if English is not one's native language, then it's better to use one's native language.