I would max awaken them at +2 because you dont lose any materials if you dismantle them later. From +3 up you will lose some mats you used to craft them if you dismantle. The difference between +2 and +3 is only 1 dodge.
AI will use guaranteed hits if hit chance is lower than 75% or something, I have a kilphe and rosa and they'll burn that AP even when a regular attack could finish it off