You want to ideally aim for 1x nothing personal, 3x double dose. (if you can get 1 SS then thats cool- didnt realise you already mentioned traits till post, rip.)
With combo points if you get 4 you spend that, dont waste energy for five, maintaining dots is a big party of your damage. Think of yourself as the melee affli lock, you usually see druids and other dot casters do this stuff too. Dot management is king.
Your opener will also dictate how well your dps goes, same for trinkets. So here are links to help you with openers to maximise your damage at the start. And to see where you are in terms of what trinkets there is blood mallet
Ideally use toxic blade off CD (providing your dots wont fall off during the window of using toxic blade.) or save it for vendetta if you have vendetta soon, same applies for Vanish its a DPS cool down as much as it is a escape.
Remember if your raid is melee reliably melee heavy get them to use world vein for that extra 700 Agi 8)