A lot of the storyline needn't tie in to any actual events in-game. In those cases, you could ask for submissions from the community. There's a new fiction writer's discussion group on
EF now (as Marco is aware). Any number of us would be happy to contribute missing arcs and ideas to tie together what you have so far.
I tried to include the overall storyline of Calypso and the corporation-dominated society apparent in your back story in my story, and to tie it into events that i witnessed as a player. The connection to some context, some
virtual reality, makes it much more interesting for players and also creates great reasons and motivations for events (as you already know).