Well, the other usual suspects are GamespeedInfo & EraInfos.
Maybe it has to do with the already high number of strong animals that I've seen on the map launching your game a few times. I know that you have the Kael trick to not kill animals when humans are out, but if nobody goes out to kill the animals, their number and strength might prevent the spawning of humans. Just a thought, I haven't played your mod long enough to know for sure.
I have krakens in my oceans and as long as they are not killed, barbs ships do not come in numbers.