Well you could add poison to the bites (either something that paralyzes, puts them to sleep, or that targets their Str or Dex, so it's easier to eat them [they still have to scream you know ]).

Maybe an ability (call it consume or something like that) that, instead of gulping them down with one big mouth, sicks a bunch of little mouths on them at the same time, each taking a bite out of them (sort of like Flurry of Blows, or maybe count as a swarm).

Something that lets the Ozodrin slip out of a grapple if it goes bad (Like the power of the travel domain).

Maybe sneak attack or something but only with natural weapons (maybe make it an eye thing that lets you "see" their vitals).

I'd support bonus Aberration feats.

Or something like the Druids Thousand Faces ability.

Immunity to poisons and diseases might be nice (they are heading down Aberration Alley after all). Maybe extend to negative levels after a while.

Maybe a shadow form (not incorporeal) that would let them into places. Think Shadow Body from Expanded Psionics Handbook.

Or maybe like an ooze they can literally squeeze themselves into places (maybe even count as a few sizes smaller for the purposes of fighting in tight, low, or generally cramped spaces).

Scent to track down prey and possibly the Track Feat as a class feature. I mean these are predators, they should have extreme means to find prey. Maybe have it as part of the mouth augments (like a snake your "tasting" the air to find them).

Climb speed?

Maybe something like a weasel from the Monster Manual which lets you "lock" your jaw on someone until they beat your grapple check?

Maybe count as an outsider at 20th level (seems standard) with a possibility to stop aging if you get to a higher level (and none of that "you die when your time is up bit").

Maybe an ability to create darkness (and since you can have blindsight like that, it won't hurt you).