Its meant to be played in a party I believe, since my friend couldn't even complete it solo without a single bird losing a package. We usually duo it or pick up a random person or two at Bloodshore to complete ours.

I agree they should adjust it so more classes and players can complete it solo or with any class of their choice, but from our experience we just switch to Thm or Con and nuke everything that comes in our way.

He runs ahead and I stay in the back and get ready to aoe nuke all enemies without losing a single package.

In other words, it was designed specifically for party play, while Grand Company leves and Supply missions were designed specifically for solo and crafter play.