>>529884227
>Is sweeping the attachment supply missions efficient for a sub lv 30 account? Or is it only worth doing after I unlock the higher level versions?
Wait till you're max level. And even then just focus on the combat reports and blueprints until you've got more of those than you need.

>>529883135
I've already got Suomi V1 though and healing isn't a particularly valuable commodity.

>>529883536
I've got Tololo V5, so I could make a Hydro team. But I'm not particularly inclined to pull Nikketta, so I dunno.