My suggestion to make a whaleship squad is:
1- make 2 squads with your bests girls AND good synergy. Try to use as much girls with the same type as the ship. If you can't (like not good enough girls form that type), use others types. you just want the best teams possible to deal with small pests.
2- Sort your girls from higher TP to lower TP. Then, use the filter to get only girls with the needed type. And then, add the bests girls until you reach 16 of them. You need 16girls o onetype to get the shipof the same type.
3- Remove the filter and add girls until your ship is full.

That's how I do.