Leoreth, I was playing as the Ottomans recently and wanted to present a suggestion I have been meaning to present for a long time. I think the Ottoman spawn should be moved to 1370 ad. I say this for two reasons:
1) Gameplay wise it would be better if the Ottomans come a little late as it allows:
-The Seljuks and Mongols have adequete time to settle the middle east and not have to worry about an ahistorical Ottoman invasion really early on.
2) The Byzantine will have more living time.
Historically:
-It is true that the Ottoman Empire was created in 1280 but it was a insignificant entity with almost no territory until the late 1300s. By flipping all of Crimea and Anatolia at a time when Byzantine, Mongols, and Sultanate of Rum had vast territories in the region creates for a very ahistorical scenario.
-Because the Ottomans spawn this early, things that were suppose to take place in 1500s and the 1600s like the Ottoman conquest of the Middle East and Eastern/Central Europe happen much earlier.
-Currently the Ottomans sometimes conquer Persian territory, this will never happen if they are spawned in the late 1300s.
Just so you can see what I am talking about, I uploaded some maps:
As you can clearly, unlike all of Anatolia and Crimea which is flipped to them, the Ottomans did not even control 1/20th of that territory
As you can see from this expansion map, Ottoman rise a major and legitimate power on the world stage started in the 1370-1413. So really 1370 would be the best date for an Ottoman spawn.
Some good side effects of this would include:
-Later, more historical fall of Constantinople.
-A more complete Mongol Conquests.
-More time for the Arabs (as a player) to reestablish themselves. I mean you just barely destroy the Mongol and then the Ottomans show up on your door steps 2 centuries before they are supposed to.
-More time for the Byzantine player to enjoy the game.
-The later the Ottomans spawn, the more historical they will act (as they will spawn with stronger troops and more appropriate techs) and the more challenging they would be to the Russians and the Austrians.
If you think about it, my argument for spawning the ottomans is the same as why you chose to spawn the Prussians in 1700. Because the Dutchy of Prussia existed since 1500s and Prussia Brandenburg since 1600; but they did not become a world power until 1700 ad.