Ideas on how to get this item lol

Paragon lvl 224 Deathtrap rogue Capped at lvl 90

Currently paragon level 224, glyphs all lvl 70ish. Still cant seem to get past pit lvl 90. I can attempt 95 but I can't seem to burn the enemies down fast enough. I can tank it all easily but the damage output is my downfall

im playing a spiritborn using the poison skills, damage on hit doesn't really help me right? I'm need damage over time primarily?

In this example, the arguably weaker weapon would actually benefit me more correct? And how do I reliable inflict vulnerable on enemy's?