I think you might be reading the information incorrectly. Deep Sleep is doze and it's showing that the phone spent 95% of the 15 hours in that state. For Awake (Screen Off) which is the time that the screen was off but the phone wasn't in doze mode, you're showing just 3%. During the 15 hours the phone was on the battery dropped just 12%, less than 1% an hour.
Those are very good numbers. You don't have a problem here.