I've been noticing that the "leash" stretchiness from rally points, escorts, etc is usually fine for fast ships, but it's really way too stretchy for big slow ships.
In dealing with some high-powered remnant fleets lately I've been constantly amazed how often a really big, really slow battleship will get really far away from their assigned goal (far away from any supporting fire) - and then Remnant capitals will promply teleport up to them and mop 'em up... and I don't see a good way to deal with this, honestly. The issue isn't fixed by assigning different goals or placements - because they stray too far away from the only input I can give them regardless of officer personality.