Did you read the part above where I wrote this:
It is an irrefutable fact of Special Relativity that if you can transmit any
information from point A to point B faster than light would travel from point
A to point B in a vacuum, then there are inertial frames of reference in which
the information arrived at point B BEFORE it left point A.
Is there a reason why I can write this irrefutable fact a dozen times and people continue to ignore it like it was never stated?
Look, I understand that people want perpetual motion machines. And I understand that people want the Earth to be the center of the universe. And I understand the fact that people want one plus one to equal three. But these things aren't going to happen.
With FTL, you have to pick two out of these three: FTL, Relativity, causality.
It is not a fact of science that you have to pick two out of the three. It is a fact of LOGIC.
Unless you've found a way to transcend the laws of logic, then we have to live within this constraint. So, if you want to have FTL, you either have to give up causality or Special Relativity. Is it conceivable that Special Relativity is wrong? Sure it's conceivable. Is it likely? NOT ON YOUR LIFE. And if you're willing to give up on Special Relativity, when why are we designing space ships based on General Relativity??? When Special Relativity goes out the window, so does GR!
So, are we going to give up on causality instead? Well, who am I to say yes or no. But if we decide that it's okay to give up on causality, then we have to bite the bullet and decide that we're okay with us being in a universe that is really, really strange. E.g., one that will thwart you somehow one way or another in any attempt you might make to transmit certain kinds of information, etc. One that might be perfectly okay with letting you visit your past self, and yet will suddenly give you a case of laryngitis if you try to tell your past self which stocks to buy. Who knows how weird it could get!
Re your space ship being in a vacuum or not: (1) It's still in a vacuum, and (2) it doesn't matter. What matters is if you can use it to transmit information from say Earth to Mars at a speed faster than a laser beam or radio signal would make it from Earth to Mars.
Re galaxies moving away from us at FTL speeds: (1) Yes, galaxies that are very far from us do move away from us at FTL speeds. Can you use this fact to transmit information between two points (e.g. two planets) at FTL speeds? No you cannot! Special Relativity says nothing at all about space itself moving at FTL speeds. It only puts constraints on information traveling from one point to another point at FTL speeds.
Go read the irrefutable fact at the top of this post again. Read it over and over again until you understand it. I can't keep repeating it over and over again for it only to fall on willfully deaf ears.