Could use some help on my flickerslayer

Greetings comm,
i really enjoy my flicker so far, but now i'm struggling to get Sirus and wave 25+ on simulacrum... i think my items are not the problem, so i really dont know, where to get some more survivability on it... I know, i could get 20% more block... but yea, i really struggle.
Thanks to all you flickerslayers in advance...
kindly regards
MrDaggi