Star Gravwells are bigger than planets, and somewhere in the manual it also mentions an effect of "gravity" where ships move faster when further/closer (can't remember which way round it was) from a planet. This could explain what you notice with stars, as you are always far from the central point. (Stars have no "mass" number in their .entity files, nor anything else that directly hints at this, so I guess this system -if it even exists- goes purely by distance from the central point, and the distance from said point at the edge of the star itself is roughly the same as the outer perimeter of a planet gravwell)

If this system exists, the bonuses might modify a scaling factor in that equation, so the effects of your distance from the planet are more/less severe.

Does anyone know if this system even exists? I think I read it in the manual, but it might have been flavour text (or even the manual of a different game )

Edit: Oh, and I haven't played SoA (which I assume is a mod for sins), so I don't know what stars look like there.

When you say "move faster/slower" do you mean stuff like the Antorak Marauder's Distort Gravity? Because my main question is about the planet bonuses ("...Core" ones), and the other question was about a permanent, hardcoded system that supposedly makes your ships even slower when further away from the planet, beyond the basic distance increase and abilities/buffs. The question was wether such a system exists in Sins, as that could lead to an answer to my first question.