Not sure what you mean by "Slaves diminish the mood of the initial subordinates.", as there are no mechanics in the game that match that description.
The key to making money as a hunter is rescuing people from bandits and monsters, then ask for a reward. Be sure to have good reputation in the area.
Work causes stress rather than effecting the slave's mood. So long as there aren't other sources of stress it shouldn't build up much for most jobs. If it does then a sundress, a day of rest, a private room to sleep in, or casting sedation are simple ways of dealing with it.
I also recommend Public Entertainer job with sundress for stress relief, because agility is great for the job and for fighters.