Honestly, most people gave up on the tower by floor 8 looking at a ton of comments from my vids, here, and my union.

I'm gonna keep going though cause even though my water teams should get smashed by floor 11 onwards (I'm amazed a 50% assault and 50% defender grid got so far), I still got my fire and my even stronger light grids.

Elemental advantage clears honestly make up less than 1/3rd of the mission medals. You can still net a nice chunk going off-element... so I'd just do elemental advantage until your advantage team starts getting beat up, then throw in your strongest provided they aren't the disadvantage element