Yes, any nation can get to lv.72 in everything, provided you start in 1399 or even before 1500.
You can limit your minting by locking it while you have less than +3 stability, but if you unlock it when you regain +3 stability it will be stuck at 100% minting. You'd then need to lose some stability to relock your treasury slider.
You can limit your minting by locking it while you have less than +3 stability, but if you unlock it when you regain +3 stability it will be stuck at 100% minting. You'd then need to lose some stability to relock your treasury slider.