Yes, we used default taxiway signs, because the airport is entirely sloped, so we couldn't reuse the one we made for P3D, but had to redo them all from scratch using the default, that have the big advantage they automatically conform to the sloping terrain.
Yes, the default taxiway signs are very bright but, the advantage is that, when MS/Asobo will eventually fix that, all sceneries will automatically improve without requiring any updates.