Typhus is hard to use in 1000 points but if you really want to keep him then make those 2 squads of cultists into a big blob of zombies, they are amazing at holding backfield objectives and tar pitting anything really but you need them out of sight and in cover, and if you're playing kill points then use them as a big blob of wounds for typhus.
Next, I'd add some more plague marines in with a rhino for both squads, they need that mobility to make the midfield a miserable place for your opponent, and stick em with a special weapon or 2, flamers for hordes, plasma for
meq's and meltas for heavy vehicle lists.
Vindicators are amazing for
csm but they can always do better in pairs, if your one goes then that's a big loss of firepower and they're a typical priority target for any smart player.
And your havocs are decent but I'd make them for
AA and give them Autocannons if you want to keep them, but I'd advise going with either full hades forge fiend or a heldrake for your dedicated
AA.
Lastly as some suggestions, drop the spawn for the extra 60 points and maybe squeeze some obliterators in there, they have proven to be one of the best units in the
csm book and work really well in pairs.
Hope I helped a bit