I preface by saying I am moderately skilled and in a dormant alliance. Currently working on Act 6 and commencing work against Crossbones. I am considering whether a rank level will help to reduce revives and potions.
Should I take two champs up to rank 5 (or 1 rank 5 and another rank 2 [6-Star]) to deal with both Act 6.1.5 and 6.1.6 or think longer term (i.e. doing nothing now)?

Namor Sig 200
CAIW Sig 160
Ægon Sig 120 (still have 59 generic & 44 skill sig stones).

Thanks.