I thought maybe there could be a Hunter duty for household npcs, or even a Hunter job for slaves, to help with food supply.
It could maybe make use of the survival stat for quantity or success rate.
Also regarding gardening, the max stat from Academy training could be set to 80, and max from 'on the job' training in the home garden set to max, so you wouldnt need a reserve gardener while one trains up from 80+. Another way would be to make Gardener a title instead of a job.
Just a few thoughts, no big deal. Food is cheap when youre a Slavemaster of Raana anyway