Hi,

to your questions:

I have just started playing FF14, so you could say I always had these issues :P

1. My laptop is sitting on a cooling pad. I had previous laptops die due to overheating, so I keep my current one always cool. In FF14 my CPU and GPU temps are around 70°c, so pretty standard for a laptop under load. I'm not overclocking.
2. Have tried that. I want to emphasize, that I literally reset everything on my Laptop, including reinstalling Windows completely. I have tried closing literally any unneeded process before and after resetting my Laptop while trying to start the game.
3. Fullscreen Optimizations are disabled
4. Tried that
5. Not possible, due to limited disk space. I did, however, simulate this by creating a symlink on C: pointing to the game directory on D: and then starting the game via the symlink. This makes windows think it's accessing the game on the C: drive.
6. Latest drivers already installed
7. One of the things I previously did in order to test 2.