It's a perennial problem because it reveals too much of an 'attempt' to grasp something palpably valuable and not enough of an actual truth to refine, iterate, and push forward.
The problem I encountered now writing my story is that it is cluttered and filled with good 'isolated' ideas that do not have parity with one another. What I mean more specifically is that I envisioned dramatic moments in the plot without realizing they would need much more contextualization to work harmonically within the context of the game.
So now I'm streamlining, excising, and recreating- all whilst keeping my other ideas on the backburner (for other stories, or maybe I'll find a way to rechannel those impulses into the current project). I just post here because I figure it's a helpful tidbit- let enthusiasm power you up but don't let it command the flow of a narrative!