STW2 AI not recruiting larger ships?

[Yosh]

Yeah I have been kind of noticing this. I was playing as the Shimazu on hard difficulty. I had already taken over the main Shimazu island, and had just taken over the Chokosabe's small island. As I geared myself to ferry my troops to the mainland for the final glorious push to Kyoto, I found that my navy was attacked by a very large fleet... of the Takeda's bow koboya.

I had a few medium and heavy bunes (as well as a small number of fire/bow koboya), but it was still a close battle, because the AI had so many freaking koboya.

But yes it does seem strange that AI clans don't have an especially diverse navy. Somehow they still have a strong navy compared to mine >.>... But maybe that's just me.

Edit: I ended up running away from the koboya in the end, and nobody won.