45°38'N-13°47'E
Deity
I think what you describe is normal. Revolts are probably caused by distance, but that should ease with eras. Have you tried reducing revolution difficulty? Which level are you using? I suggest 0 since you are experiencing difficulties, then you might try 2.5. Also, in the latest revision managing a big empire will be harder but a normal one will be much easier. And if you set revolution difficulty to 0, it will be easier on general.
You should be able to grant independence (vassalize) to your colonies, if you can't there must be something preventing you like reaching maximum number of civs.
You should be able to grant independence (vassalize) to your colonies, if you can't there must be something preventing you like reaching maximum number of civs.