You are already going wrong. Dominance is a Boruto stat and not tied to each individual girl, and it is unlocked with a late game Himawari scene.
This is not right. You need to see and do a certain scene to trigger upgrades to level 2 skills. Nothing to do with increasing numbers.
Dominacne lvl 2 comes from a scene where you are teaching her to train and fix her posture (Himawari) and you cannot get to that until you have her obedience level 2 (the bikini photo shoot.)