Well, i think thats the visual that it should be. I have as well the same shield (i think) and the aspect of my ship is similar, if you get closer to the ship with the zoom u should see the paneled shield effect, and a reflecting effect from far away. I dunno if in the case of Starfleets its different. Now, maybe the textures on the bird of prey are a little messed up when using the shield, but im not sure.
I will go out on a limb and say it is WAI, this is the same issue I have on the ar'kif that certain shield skins don't cover the entire ship with their effects, or are two varying effects again not fully covering the entire ship, and making it appear pretty hideous IMO.
OK, I now own the complete set, and not only is the shield not covering up the hull completly (as stated in the OP), leading to a really ugly looking patchwork pattern on KDF ships, the visuals for the impulse engines (which I'm told are supposed to be blue flames) don't show up, instead leaving me with the standard red KDF impulse trail.