Im really liking the Byzaahs, maybe its because Im in Monarch and not Emperor, who knows. Japan seemed so tough, but yet Silver 2039 is doing very good.
I took Jerusalem and another Garagum Desert town from the Persians. To unite the whole country with Leipzig (my far east city). Later, Ive taken all of the German lands, then the Romans were kicked out of the European continent by China and India. Ive since kicked out China from Europe, only 2 Indian cities remain in Europe, but were at peace. When I discovered Replaceable Parts I had to go for a little adventure in West Africa to get some Rubber.
Im currently in the 1700s now with about 10-15 turns away from getting Tanks! Is the pace going as you wished??? It is one crazy world war out here!!! And very much like WWI

A little frustrating, because so-called allies suddenly backstab you.

Right now, Im at war with all of my neighbors, but then all of my neighbors are at war with each other, CRAZY!!!
The Theory of Evolution has helped me gain a tiny lead in the tech race.
One thing that is strange however, is that Ive noticed the size of some Chinese and Indian cities going down FAST. I thought perhaps you made Industrial Age units cost 1 population point, but I cant see that done in the Editor. There was one city, which went from 12 to 1 in a hurry. No-one has an Air-Force and obviously the AI isnt using Arty, so I really dont know whats happening.
I checked to see in the Editor to see if you had taken out the Aztecs, because there is no sign that they ever existed.

But they are in the Editor, so thats a bit weird.
Thank you so much for putting in the Naval Infantry.

The Romans and Germans had been left to 1-tile city islands and I was able to finish them off, for the sake of game speed, which is much improved.
IMPORTANT
One more thing the tech Railroads was being ignored by all of the AI. I believe this helped me gain that bit of edge against the AI in the tech race, once I started building my rails. I think you should remove the Not required for Era Advancement tag, so that the AI will go for it.
Finally here is the world in the year 1250! This is after I took them 2 Persian cities