First scene. The bombers were terrible.

You just write a shitty story. It's that simple. ;)

True. I tried to think of ways to do it. Like it's attracted to the ship or the target has it's own gravity. The bomber will have to negate that somehow to prevent the bombs attracting to itself. But yeah, I agree with your point, since all the other bombers in SW are propulsion based.

They were close enough to a planet to have gravity to work with, and if they didn't there was probably some sort of bomb-launching device that didn't rely on gravity.

But it's totally believable that the REBELLION would have slow, clunky, vulnerable, gravity-dependent bombers that were not very useful in modern combat situation. Where the hell would the REBELLION get expensive modern tech? They're out of power and have few allies and less funds, they can't have the budget to buy new ships even if anyone will sell to them now that they're losing. Maybe someone donated those crappy ships because they wanted to be in good standing with the Rebels in case their fortunes changed, but whoever that was didn't think enough of their chances to give them anything good.

The bombers could still be pushing the bombs out, and even with no gravity, they would keep going until they hit something.

However, there was definitely artificial gravity inside that ship all the way to the exit on the bottom, so the bombs could still be falling until they pass through the gravity field, and then momentum carries them on through empty space.