I'm trying to decide how well your approach would work for me. I tend to write entire scenes out, although often those scenes aren't in chronological order. I think part of the problem for me is that I don't often get flashes of fic (or when I do, it's when I'm doing the dishes or something and my hands are all soapy and I can't use the computer and then promptly forget the wording I'd liked so much).

...of course, I also don't have that many stories on the go that are actually whole stories, so. Hmm.

Do you use Scrivener and if so, have you used the snapshot function? It seems like it would be a bit of a pain to take a snapshot every time you open up a document/go back to it, but it might be a useful way to track your progress and/or look at how you change things as you go.