So, I wasn't having a good time with "Last Battle" and "Ghost Ship" because mechanics aren't exactly like what they're in kRO. In Last Battle, Tan stuns a lot longer, in the original and he doesn't spam hammer of god either. His damage doesn't seem to be that high as well, I'll provide some videos as a reference for furthur adjustments.
For Ghost Ship, everything seems okay, because his mechanic isn't all that complicated. Just lower his waterball damage then everything should be fine.
https://www.youtube.com/watch?v=oI47QSkXo9o <-- Last Battle
https://www.youtube.com/watch?v=TdV2RG7VjvQ <-- Ghost Ship