The physics you presented is very off.
First, 9.8 m/s/s is the acceleration of things that fall near Earth's surface, so the Earth is not pulling the moon with that acceleration, it's far less. A basic model predicts the moons acceleration to be GM/r^2 where G is the universal gravitational constant, M is the Earth's mass, and r is the distance between the Earth's and Moon's centers of mass.
Second, you have presented a misconception that "orbiting" does not include hovering over the same position relative to a point on a planet. The thing is the planet is not still, it is both spinning and translating. This means in order for the big ship to view the planet as not moving, it also needs to be orbiting around the planet at the same speed that the planet is spinning while translating at the same speed as the planet.
My general point is that people's arguments regarding how star wars simplifies space flight into pseudo-atmospheric flight mechanics is generally correct. It's not an awful thing though. Space is so foreign to almost everyone on Earth that trying to model realistic outcomes in the movie would probably not make sense to most viewers; so it's being greatly simplified in order to cause less cognitive dissonance to the viewers.