So first off - I dislike underwater battles. I find them tedious.
That said, I recognize underwater battles as a necessary form of evil within this game. So this brings me to my current predicament.
Green Plesioth (G-Rank)
I mainly use LS, with the very occasional hammer and lance. I mainly only use Hammers when fighting Raths, although in the end I decided it was far more efficient to stick to LS because of how hard it is to aim for their head. And I only use lances when fighting Diablos, Uragaan, Barroth, and Jhen Mohran, I'm not very good at lances either.
So my question to the community is what kind of fighting style should I employ for underwater battles with a long sword? Not just particularly against Green Plesioth, but against Goldbeard Ceadeus too for example. My current problems include not being able to find a good enough opening to hit a monster, only being able to hit them once before they move around or I'm forced to dodge (no stunning power), and never being able to get a first level Spirit Blade.
I am really not looking forward to G-Rank Lagiacrus and Abyssal Lagiacrus simply because of the underwater battles. I probably had more fun hunting Ivory Lagiacrus than the regular one. I have a LS for every element, and my strongest LS at the moment is an upgraded Jho LS.
Thanks for any help.