The problem with all fixes it inherently nerfs all other ships.
I don't see it, unless you view one ship moving up in power as it instead staying put and all the other ships moving down in power. And even if you do, it's exactly the same effect. Power is relative. X-wing moves up one unit or everything else moves down one unit, all that happens is the gap closes by one unit.
Power in this game is all relative. So yes, that is exactly what happens.
X-Wings were IMO the best ship in the game, but then came B-wings, then they made B-wings better. Making B-wings better makes people more likely to take them. If they are more likely to take them then they are less likely to take all other ships.
I will admit that how often a ship is taken isn't exactly the same thing to how good it is, but it is an indirect measure of how good it is.