I think tht tge best class is "Builder of the Realm". Best for sale positions ate unstable and can be a product of any class. Item level means pretty nothing too, sometimes some i40 items may get more profit than i55+ greens.

Ps And i don't see any well saled for 30K food on my server )
Max price has Tailor-made Eel Pie - 200K, 10-15 items/day, ingredients costs ~ 100K
Roast Canard - 35K, 1-3 items/day