5x all crisis - Scourge

Hello,

Im on around 1000h played, my current run is shroudforged machine gestalt on GA, crisis is 5x and I have defeated all but the last crisis which is the Scourge. The damned insects has over 5 billion fleet power. I cant get over 100M. My ships are designed to exploit their lack of shields. I'm running riddle escorts and enigma battlecruisers, but I cant seem to win a fight with their monstrous fleets.. Thing is; they are not moving so I can't really funnel them into any defensive position. I just keep throwing my ships into the grinder.

Any tips from more experienced players?