I completed post-patch tier 4 solo on a zerker engi and I can say the challenge is very rigid in the current doable method. The scaling when grouped seriously does not allow much space for error when pulling, taking down, and resetting since everyone needs to be tight on the maneuvers. I pretty much had to respec/gear specifically just to overcome the encounter’s obstacles.
As for the strategy on my engi, I used full zerk rifle gear with power buffs/food. I went 30/20/0/0/20 with notable traits being exploit weakness (cripple at 25% target hp), Rifled barrels (increased range), rifle mods (rifle dmg), sitting duck (immob cripple), speedy kits (swiftness), and power wrench (recharge on tool kit pull). My utilities were Tool kit for the magnet pull, grenade kit for the ice nades/burst belt skill, and battering ram for the tool belt ranged snare. Net shot and one snare skill for the first plunderers until 5:30 when the right side starts spawning. I used magnet whenever it’s up exclusively on the right side spawn whenever the plunderer goes or returns on his trip since his respawn cycle should have magnet pull off its cooldown by then. The middle spawn can be CCed by the rifle’s overcharged shot or whatever snare skill you can spare. Middle seems easier to handle since they have longer circuits to complete.
The main thing I thought that helped is that you can stay in the back of the rock for as much time as you can afford so that the mobs fully reset then finish the plunderers on their return trip since you should have enough dps/snare to burn them. The main priority should always be on the right side spawn since its circuit is way shorter and should be dealt with immediately, but that doesnt mean you go running to the mid trying to finish the plunderer off. The other 2 spawns usually have long enough runs that allow you to run to the back of the big rock and stay there until the middle mobs reset to a safe distance.
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