After some calculations on the treasure missions other than rares missions [/ b] it appears that the threats to counter are :
Threats Countered with Number of mission
Destroyer Battleship 34
Evasive True Iron Rudder 32
Swift Blast Furnace 28
First Strike Felsmoke Launcher 21
Minelayer Trained Shark Tank 21
Carrier Submarine 18
Submarine Destroyer 16
Land Objective Transport/Murloc Crew 11
Battleship Carrier/Arakkoa Crew 8
Dense Fog Fog Lights/Draenic Crew 5
Icy Water Ice Cutter/Orc Crew 5
Stormy Weather Bilge Pump 5
Cursed Crew - 3
So at the begining, to get the 25 treasures missions, it appears that the optimum compo should be like:
3 Battleships (so really important to get the reputation in the jungle)
2 Destroyers
2 Submarines
1 Transport
and we should equip them in priority (in brackets the number of missions with that threat) :
Evasive True Iron Rudder (up to 4, one on each type of vessel)
Swift Blast Furnace (up to 3, Battleships (19), Submarine (11), Destroyer (8), Transport (8))
First Strike Felsmoke Launcher (up to 3, Submarine (13), Battleships (11), Destroyer (6), Transport (6))
Minelayer Trained Shark Tank (up to 3, Battleships (14), Submarine (9), Destroyer (5), Transport (4))
Dense Fog Fog Lights (only 1 on a Battleships (3) or Destroyer (2))
Icy Water Ice Cutter (only 1 on a Battleships (3) or Destroyer (2))
Stormy Weather Bilge Pump (only 1 on a Submarine (3) or Destroyer (2))
So up to 16 improvements when all the vessels are epic, for example :
Battleships True Iron Rudder, Blast Furnace, Felsmoke Launcher, Trained Shark Tank, Fog Lights, Ice Cutter
Destroyers True Iron Rudder, Blast Furnace, Felsmoke Launcher, Trained Shark Tank
Submarines True Iron Rudder, Bilge Pump, Felsmoke Launcher, Trained Shark Tank
Transport True Iron Rudder, Blast Furnace
Notice that Apexis Crystal missions are treasure missions but not legendary one.
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Edit of July the 13 : When the 25 Treasures are done and got the Carrier + 10 ships :
Update of July the 18 : Optimisation to use 9 ships
With some (kind of complex :o ) calculation I have found the best compo for me and I share it here if you have the same objective as me. It does not permit to do all the mission (it seem to be impossible or I did not search enough) but the one I want :
- All Iron Fleet Treasure Chest
- All blockade
- All legendary (Elemental Rune)
- 2 sorcerous
- Most of Apexis Crystal
- and most of the more or equal to 5000 XP missions in case you have to build another ship after destruction
Missions about gold are not taken into consideration (but can be done probably sometime)
Destroyer Blast Furnace + Gyroscopic Stabilizer ---- /!\ Human/undead
Destroyer Trained Shark Tank + Felsmoke Launcher
Submarine Trained Shark Tank + True Iron Rudder --- /!\ Human/undead
Submarine Trained Shark Tank + Bilge Pump --------- /!\ Human/undead
Submarine Blast Furnace + Felsmoke Launcher-------- /!\ Human/undead (or Panda it's for the 18 hrs apexis "Storm Front")
Battleship Felsmoke Launcher + Blast Furnace
Battleship True Iron Rudder + Ice Cutter
Carrier Trained Shark Tank + True Iron Rudder --- /!\ Human/undead
Carrier Blast Furnace + True Iron Rudder
You'll need at least one Draenic crew (equal to High Intensity Fog Lights) on any ship to handle some interesting missions and it should be easy to get (not like the murloc crew who is very rare.. for me ;) )
You have to try to obtain the maximum of Human/Undead crew on each ship to increase the chance for missions not taken in consideration and it's especially important on ship marked with /!\ Humain/undead as those ship handle missions with more threat that they can carry (it permit to get 98%). Draenic crew (equal to High Intensity Fog Lights), Murloc Crew (equal to a Transport ship) or Pandaren crew (chance on >= 18 hrs mission) can be good but I found the rest useless.
For the 10th ship you can use what you want/need... Personally I don't need the transporter as I'm not interested in mission it handle (gold and little xp)... Even the derrick mission who need a land objective don't need one because it have a 100% chance of success basis (don't understand why..) So personally, finally, I use the unused ship to have the human carrier ship in double as a spare one in case a 98% chance of success mission fail and destroy it.