I wouldn't bother with tripling up on any DS for each ship really.
Titan, Vengeance, or, Leo-CV
Pentagon, Achilles, or, Intruder
Triumph, Condor, or, DroST
Union, Dictator, Leopard, Lion, or, Confederate
Buccaneer, Danais, Mule, Manatee, or, Jumbo
Give each ship a slightly different selection of ships but have 1 from each of the 5 rows with an overlapping 6th.
Use the 6th overlap to have a pair of smaller ships. (Like Leo+Confed, or 2x Leo-CV, etc etc)
Pair up the mech carriers that have ASF w/ the ships w/ Leo-CV to add more ASF.
Put the larger Cargo ships w/ the smaller Non Cargo ships.
Use the 6th Warship to double up on Cargo Ships a 2nd time since the overall mission is convoy escort & the holds will be full of supplies.
Spread the tonnage around so each DS Flotilla is similar in terms of "Tonnage & Abilities" but in turn looks different from each other.
Examples:
Flotilla #1 - (Double ASF)
Leo-CV, Leo-CV, Achilles, Triumph, Union, Jumbo
Flotilla #2 - (Double Assault)
Titan, Intruder, Achilles, Condor, Dictator, Danais
Flotilla #6 - (Double Cargo)
Vengeance, Pentagon, DroST, Lion, Buccaneer, Manatee