Huh, interesting that the AI wants to focus much on one part. Nice tips.
Still, naval battles are frustrating. Ships like to rout or surrender a lot. From what I've heard: get explosive shells that set stuff on fire. But just have more ships than the other person.
Yeah I remember that from vanilla as well, a naval general helps a lot, a disloyal general should be made a naval general if needed because AFAIK only on land will disloyal generals turn on you and take some of your troops with him in the middle of a battle.
It's curious how all the naval tech is so concentrated in one tree, I'm ignoring completely for the moment since I can't even see any BEACHES, but all those shell upgrades and whatnot, I wonder how useful they'd actually be?
The quickest way to increase income is to take over enemy provinces, for a 3400 koku farm upgrade you could raise an army and get 10x as much income from conquest. With that mind, all research supports land army, research redirected towards naval research? I have a hard time believing it could be worth it...