Does Athena have ways to build 700+ Maelstrom when mobbing/against EOS? It seems doable enough on huge bosses where things like Storm Front and/or Hail can be put to full use. But what about mobbing, or EOS who cares not for Hail nor Storm Front? 

Maybe with multiple perfect hyperion elemental shotguns equipped at once? Though that'd be for EOS...general enemies through a level would not be able to survive long enough. 

Does Athena basically have to farm up a low level storm front and maybe elemental shotguns too, for the purposes of building high Maelstrom when going through levels?

I get that it's overkill really to try and get that high in those contexts so it's more of just a for fun kind of thing.