i say remove the bonus of fire archers against ships entirely, or keep at most 50% bonus, the reason y fire archer was so good against ships b4 was simply cause there were not many substitutes, but now there r thanks to u
wat makes fire archer so effective against ships, is it the arrows? no its the burning effect, and now there are many substitutes for applying burning effects, including putting a raider in viking ship/ carrack
my suggestion is simply increase the effectiveness of burning effect itself, may b 100% (8 damage) it deals high damage but can also b repaired in the nick of time to save the ships, as discussed in email, we should make ballista the main anti ship ground unit from now on, while fire archer should b like poison archer, dealing dmg over time to slowly whittle away enemy ships instead
also we can give the 150% bonus of fire archers to raiders instead (since fire ship has two range, a melee raider should b more effective than fire ship)