I am having extreme difficulty getting the Sea of Ash 3 voyages to discover the new areas.

Sending two subs.

Sub 1:
Surveillance: 180
Retrieval: 80
Speed: 85
Range: 40
Favor: 80

Sub 2:
Surveillance: 115
Retrieval: 35
Speed: 75
Range: 115
Favor: 80

So any advice for me?