That's just not how wars vs 1000+ development AIs (or humans for that matter) work in this game. By design too, given how forts and merc pools function. Siege while dealing with threat of opponent army is very much part of the design of pitched wars between large nations.
Sieging while threat of opponent is not what I meant. I don't know how to say it. But Problems might be gone with slower speed. If there would be terrain speed and maybe no free movement and recruiting in tributaries would make fighting him, not a hassle.
Also Tributaries never breake free even if their ally is stronger, than Ming.
My Problem with Mandate and Meritocracy is they penalties only apply to War and Espionage. When my legitmacy is low or Republican tradition are low I get unrest.
Ming has thorugh animist adpation already a 0.5 reduction. I don't want it to be significant modifier, more like 1 unrest at 0 Meritocracy to at leas set of bonus they got.
While agree they historical had no big separatist event, but massive Rebellion through famine and other things.
After those discussion and little big experimenting in my game my new proposal,
Neighbours:
Make the horde a bit stronger and more likley to break away from tributaries. Especially the AI hordes
Have Tributaries with strong allies more likley to break away
No Recruitment and no automaticly granted military acess in tributaries
Ming:
weakening it:
make Meritocracy at 0 a little unrest modifier my proposal is -1.
Make income from tributaries less.
Have Events increase inflation
(Ming was a Production powerhouse and Europe dumbed a lot of Gold and Silver there, so they had problems with their currency, their is one event already in place. But in the current setup in not significant enough)
Making Ming stronger:
Let it build more ships and fight pirates. Ming doesn't fight Pirates. Also it has bunch of transportships it never used after 1600, because his Navy was always very weak compared to all stronger neighbors.
Let it develop more and not tech 9-15 years ahead. Also let it develop a lot more in cheap farmlands provinces. He does it to a certain amount, but some provinces, which would be very cheap to upgrade are left alone at 6, while other are build up to 20-40.
Generell Problems that will fix problems.
The endless mercanary problem that addressed in other threads.
The everybody has to much gold Problem that is addressed in other threads.(While Ming was really rich it had Problems collecting it, but I don't know how show that ingame)
The manpower problem. I thing in late Game the manpowerreserve and forcelimits and replenishment feel way to low and the AI has Problems to manage them.
Also AI should go over force limit if they can afford it.
The fast movement which is already implemented in the next patch.