"There is no writing; only rewriting." 

There you have it. When it comes to professional writing, you have Editor(s) who draw these lines for you. Even if you, the author, WANT to keep rewriting because of your, maybe, insecurity the editor will be there to step in, laugh at you, and wave you off. 

Online, as a hobby, it's really more perfecting the art of the 'first draft.' I've never, ever, ever done a full re-write of a RP post. Nor will I ever. It's a waste of time/energy. I may correct typos or fix a sentence here or there that could use a re-work for clarity's sake, but usually that's all. Will I stop and read my post and say to myself, "That's...crap. Fantastic." Oh yeah. All the time. Way too much. 

So next time the same sort of IC circumstances come up that made me really loathe a particular post of mine, I'll have that in mind and maybe put much more of a concentrated effort into the post. And of course when I'm not sure I can trust myself for the quality of a RP, I usually just ask a few RP 'buddies' whose opinions on RP quality I trust. It's the best (read: least maddening) method I've personally found.