The easy solution is to lower muslim ships to next to nothing. It wasn't until the ottoman turks in the 1400's did a muslim power have real shipping and even then it was rather weak compared to small powers.
Dutch Areas, Genoa Venice should be the only ones with real navies they can field for themselves. Dutch areas because abundance of cities, and genoa and venice because they are trade capitals and needed the navy for shipping. Perhaps there should be a flag for "natural port" areas to encourage it and rebalance the harbour chain line
I can't count the times the fatamids have taken the entire byzantine empire in <10 years because they ship an entire army into greece. The byzantines lose greece and most of the constantinope area while the rest defects.
Dutch Areas, Genoa Venice should be the only ones with real navies they can field for themselves. Dutch areas because abundance of cities, and genoa and venice because they are trade capitals and needed the navy for shipping. Perhaps there should be a flag for "natural port" areas to encourage it and rebalance the harbour chain line
I can't count the times the fatamids have taken the entire byzantine empire in <10 years because they ship an entire army into greece. The byzantines lose greece and most of the constantinope area while the rest defects.