I would remove
MoN on sorcerer so you can roll on Divination table and ge tthe primaris and force. Maybe terminator armor, meltabombs and a force axe.
Forewarning gives 4++ for the whole unit
Precognition Psyker reroll hits, wounds and saves.
Misfortune gives rending(on a enemy unit)
and Primaris Prescience is also nice, reroll failed to hit for the whole unit
Maybe take
VOTLW on the 2 man Obliterator squads you don't want to see them run.
You are going to deepstrike both the sorcerer and Typhus with 1 obliterator I think they wil be shot down the turn they land. Maybe try some other means of delivery like a slingshot spawn squad or bikesquad.
Our lists are very similar so you might want to have a look at mine.
http://www.dakkadakka.com/dakkaforum/posts/list/668599.page
Note that my Obliterators don't have
VOTLW because me taking the Daemonheart relic from the Crimson slaughter denies me the use of
VOTLW.