You know, I really don't think that the ships-dont-look-as-big-as-they-are problem has anything to do with distortion (or lack thereof) of the viewpoint. I think it's simply that, as you're flying along the ship, there are few reference points, and so it looks like you're barely moving. If the ships had a lot more surface detail, or much more detailed textures, it'd probably feel quite a bit bigger.
Giving points of reference is the reason why you see movement streaks of little dust and such from your cockpit: if you didn't no matter how you moved through space, you'd feel like you weren't moving at all. More "realistic" sims dispense with this fake debris stuff, but usually compensate by making a 3d hud grid or something similar (c.f. M.I.S.C.).
Here's an experiment: try doubling or tripling the uv scale of the textures of a capship, then see if it feels longer when you fly against it. It'll probably be much uglier at a distance, because the detail is lost in all the texture tile repetition, but feel bigger up close.
Keep in mind too that your ship is moving pretty fast as well, so of course you can close very large distances quickly, making everything feel smaller.
Perhaps bump mapping texture surfaces might be a way to add points of reference to a ship, and make them feel bigger. Just a wild guess.