From the submersible information thread:

Submarine Stats

Surveillance: Influences which items drop from the loot table per sector (Rarer items have minimum requirements). May also influence the discovery of new sectors.
Retrieval: Influences the extraction rate of a dropped item. Affected by weather effects.
Speed: Influences the duration of a voyage.
Range: Influences the distance a ship may travel during a voyage.
Favor: Influences the number of anomalies detected at a single destination. May also influence weather conditions encountered.

I am currently trying a S 85, R 100, Sp, 80 Rng 85, F 75 build.

I once got wax with a straight shark build S 30, R 110, Sp 110, Rng 70, F 70.

You could skim all through the submersible information thread to see if there are ideas there.