Other options include Doublicious and Dark Agent (if I remember her SA correctly).
But Silent Kill and the above dudes won't have much of an edge (if at all) compared to a high damage, straight-forward (no debuff) fighter.
This node is mostly a stat check. If you can't deal significantly more than 10% damages over 10s, it's a hard wall with little to no way around it (afaik). Once you get there though, it's an easy one.