In my Trek novels, to rationalize the gravity somehow not reaching to higher decks or outside the ship, I rationalized as the result of the grav plates producing virtual gravitons that decayed after traveling a few meters. I may have also said they're polarized to explain why their effects aren't felt off to the sides.
Still, I would've liked to see a more plausible approach to artificial gravity somewhere. One ship design I came up with once, in my own original SF worldbuilding before my Trek novel career, was built around a cylindrical engine core whose FTL drive leaked gravity.
Your Hub series?