One of the reasons I've stopped posting stories before they are complete is because I often find, after I've written a part/scene/chapter/etc., a new perspective for it jumps out at me - a way to make it better, to make all of the bits and pieces I've thrown onto paper make more sense. Occasionally, it's just the turn of a word or a change of a phrase - I usually catch those in my pre-upload re-read ritual. Sometimes, though, it's a way to promote better understanding of what the characters are doing - or even to tighten a few of the different threads of a story together.
I found myself doing that overnight in those moments before, after or between sleep; honestly, it's when I do my best work for some reason. As I mentioned, the story is finished - I even finished Chapter 24 yesterday. It is complete - not postable, I still have to 'prettify' it (add descriptions where I missed them on the first few passes, add character emotion and motivation in areas where I didn't convey them properly), but it is intrinsically finished. However, last night I found a way to change Chapter 29 to make it better - and a little longer but I don't really care about length. The same with a few items in Chapter - oh, I don't know, I'll have to look up the chapters. Thankfully, it had a tie into chapter 14, which I haven't posted yet.
Anyway, I think in the future I might actually go a bit further afield and wait as much as a week or two after the story is finished before posting; kind of let my mind percolate on it a bit and make sure there's no part of the story I can 'make better'. I made the edits to chapter 14 early this morning (I couldn't wait) and am going to re-work some pieces of later chapters today or tomorrow.
In the meantime, Chapter 14 is queued. I hope you enjoy it - and it answers some of the questions I've been getting about 'the fourteen swords'. :)