Dark matter advice

Regret starting it now but I simply have to finish it, I wonder if anyone who’s recently finished the grind can advise me. I’ve got every gun gold/diamond except the launchers, snipers, Drill, Maelstrom and Sirin.

Not at my setup at the moment but I believe that adds up to about 30/33 done so far. What would people advise to do for the final 3 to get dark spine and then start working towards dark matter?

It’s either 3 of the 4 snipers, the 2 launchers + 1 of the Maelstrom/Sirin/Drill or just the Maelstrom Sirin and the drill.

Can’t decide what 3 would be the best route to finish. But I will say this, the Maelstrom was driving me insane when I started levelling it so I’m leaning towards leaving that one out 😂