Financial reforms are in need and I would like to see him have problem with not enough burokrats and taxation officials becouse autors forgets about lack of edukated people at that time. Like in Victory 3 if you dont have enough burocrats you would collect less tax and be more prone to coruption
I love this novel and it's really interesting but theres's Korean novel called Black Corporation Joseon and you can draw inspiration from there its really goood