Inlet Challenge Mission

Okay, I officially blow at making good PvE H&H builds.
The farthest I can get is to the 3rd island (1st round)... My timer always runs out there.
What am I doing wrong?
Currently as...

Me as a Glass Arrows Ranger
Margrid as Burning Arrow
Dunkoro as DH
Talkhora as RC
Aidan
Herta
Cynn
Mehnlo
(Yea, tried an all-ranged group here because of that annoying corsair net)