Aside from the whole LF vs. VHF discussion going on here...
I've noticed some small issues with the Behemoth. The Behemoth is roughly 3 million credits more expensive than the Luxury Liner, but it has less weapon mounts, a slightly smaller cargo hold, and not even half of the armor that a Luxury Liner has.
I'm thinking that either the price should be reduced, the cargo hold increased, or the armor increased. Personally, I think that increasing the armor would be best. That thing (along with most other Rheinland ships) just screams "Thick, impenetrable armor".
------ EDIT: Okay, in light of these new discoveries in the Homeworld ships, I went into SP and tested out each one of them. Yes, the Kiith Somtaaw HF is very agile for its class and size, but what I noticed most was the Kadesh HF. If you thought the Kiith Somtaaw was bad, try this one on for size:
Kadesh HF, sold on Battleship Karlsruhe in Frankfurt, has six Class 9 gun mounts and a Class 9 shield mount, as well. And it's more agile than a friggin' Starflier. See for yourself, it outshines the Kiith Somtaaw HF in turn rate by a longshot. Something definitely needs to be done about both of these ships.
I'm not yet done testing out every single one of them, but I'll post again if I find another Homeworld ship that doesn't quite fit in its class.
EDIT AGAIN: Okay, now I'm just going to make a list of some of my observations here: Kadesh HF: Way, way too agile (as stated above). Kadesh Freighter: About as agile as your standard HF. Kushan VHF: Also about as agile as your standard HF. Kiith Somtaaw SHF: A teensy bit too agile for something classed as a "Super" Heavy Fighter.
That's what I found. Mind you, I didn't go looking into power output, weapons classes, hitboxes and the like; just agility. If you want to look into the rest of the stats, well, that's up to you.