as a longtime GSC player, i like the list (except lictors, which i still dont feel have a place, even if their statlines are useful. i'd rather have smaller teleporting genestealer formations myself)

i utterly loathe the hyper predator. its just super-wrong and utterly against the fluff i agree as to the possability of something bigger. i suggest that you expand the looted PDF elements to include Firestrike launchers (ala mossinians) and if you want a "big thing" then a stolen superheavy would be ideal (limited in number of course, and i'd recommend the slightly down-gunned versions i've used in my bloody hand list, as it fits the general "not quite as good as the main imperial tanks" theme you've got going) aside from those changes, i think the list is pretty much 'where it should be'

I'm pretty sure in Warriors of Ultramar Lictors turn up before the hivefleet. One near the beginning 'drops' into a field and kills some farmers and pre-the hivefleet reaching the main planet evacuations from farming communities are harrassed by Lictors

as to point-bumps for stealers vs lictors, i dunno. compare a stand of genestealers to a single lictor. lictors gain: an extra sniper attack, an extra point of armour, firefight, and an invun save, at the cost of a point of CC, and LV status. if anything, i'd say stealers with teleport would still be worth less than lictors (though obviously more than stealers without teleport)