Higher the rank of Stonn and four of eleven the better. Loot bonus while raiding increases as you promote B'Etor so the same for her. This crew combination can be in any order on the bridge as for all 3 it is the officer ability that is being utilised. NB if Stonn is busy or lower than rank 4. Swap B'etor to an officer slot and replace with 2 of 11 as Captain.