You think the kororvesh vessels look like they have larger hits Sig? That confuses me on all but the 4 hit Emissary, which I can see.
The ultimate answer to it all is the one put forth at the beginning of the BBB, the one that states that everything is not to scale and is only a representative model of the ship in the stem. Of course, thats not very satisfying an answer, when you know that they COULD easily do it to scale if they wanted to, and most of the ships seem to be to scale.