Nice maps. It seems that I have to keep my arrival orbit around Jool, for my future Laythe mission, small. So that I won't crash into an other moon. @Geschoßkopf: I can't remember trying to place a craft near the SOI border, so I have no experience. But to KSP, an object 1m inside the sphere is orbiting the 'moon' and 1 m outside it is orbiting the planet. A rough edge. So I can image that placing crafts ON that border on the fake L1 and L2 point you mention, that tiny rounding miscalculations building up to kick your craft somewhere.