I finally did it! (new campaign, though I played the old one until late 1810s. I learnt a lot about late game mass conquest but I couldn't achieve it).
Thanks for all your comments!.
I finished the WC at 1809, one-tagged late 1810s as I had to pick colonialism to annex that lousy vassal in Africa (I had no direct province to him so I could not core)
-I did the usual start for a Coptic ottomans:
- I handled the Timmies (got a Persia vassal with almost no LD) and the mamluks better than my previous campaign so I could get into India and east Africa almost 50 years earlier.
- Usual set of starting ideas (religious, influence, admin and diplo).
- I Left Europe untouched for 2 centuries (a huge mistake, specially because of the Iberians)
- I got a foothold in India by 1500 and started heavy conquering there before an Indian supper blob was made.
- Africa was a cakewalk and I got to Zanzibar by 1550.
- Steppe nomads and most of Africa and Indonesia was done by the first half of the 17th century.
- I fired C&C. Having 100 abs and a threshold to lower it sometimes without falling down 100 if I had to increase autonomy or lower my legitimacy was a blessing.
- The first war against China was at 1650. Got a bunch of his tributaries during the war and after that I left them be for the next century.
- Started my European conquest by 1660 by invading Iberia and getting a foothold on the new world.
- From there on it was pretty much straightforward conquering.
- I didn't fire the revolution as I was pretty happy with my conquest pace. Looking back I don't regret it.
- By the mid 18th century I realized I could aim for a one faith so I put all my effort into the new world. Unfortunately I didn't handle it good enough and I couldn't get all of it until 1780. I forced religion on all the CN there but unluckily by 1820 there were about 10-20 provinces left to convert (I spammed cathedrals all over the place but it wasn't enough). Also I am not sure if those uncolonized sunni and fetishist provinces in Africa had to be converted aswell.
Now the mistakes:
- If I had handled the Iberians earlier as some people suggested (and therefore most of the new world earlier) I could have done a one faith.
- I could have finished it a lot faster by micromanaging better my armies and CS annexations timing during the last 120 years.
- Forming the Roman Empire. I'm pretty sure I lost the jannisaries bonus because of it. Though I could easily defeat all my enemies by then I still feel it was a huge mistake (I already had the achievement).
So that's all. I was looking forward for this for a long time as I had not done a WC since EU3 and I just couldn't imagine doing it again, this time in EU4. I'm going to try to one faith in the future, probably with another country (Castile seems one of the forums favorite for it).
So thanks for all your advices!
I final