i've make EO BB decreasing by 40 in event between 1419 & 1550, and it's still no good, because the AI files are bad. Ottoman annexe lots of countries that are not on his cores, in the beginning of the game, with the annexion of Morea, Byzance, Trebyzond, and half Armenia, before 1430. EO never grown good, and burnt properly all countries in which it have cores on, like france, 90% of the time they don't wanna get their cores back, they prefer growing on another side.
Systematicly EO is eaten by Austria , it starts in middle 1500's afterwhat, it's the massacre ...