I don't really use this, and am not sure if moods affect it, but if they did and I was leveling a lot of skills with it I might try very happy. I know that being very happy adds a 40% bonus to all skills, except charisma which adds 80%, and is usually second best after the ideal mood for a skill. In other cases, like with charisma and with mischief if you don't want to get enraged, it is better than the ideal mood.