Rich is right.
I just straightened out my '00 RG2020X (which is hecku-fun with the DE all wired up) - I went through 2 sets of posts before I caught a pair that were OK, and filed the flat side knife just enough to make the edge "less wide", but not actually sharp. I could see even an experienced tech would make the mistake of over-sharpening. Which is why I really have been trying to hone my set-up skills over the past year or so because how the he11 is someone supposed to know what I like when I
can barely figure out how I want it!
I say this about the tech section in Rich's site, here, or anywhere - READ all of the instructions first, then tackle the project. If you do, then it's a matter of your own skills. I've blown through a few things and made dumb mistakes (fortunately correctable ones) that I could have avoided
if I was correctly prepared.
You have nothing to lose by trying it - as I said to Rich when he advised that the DE filing was dangerous, "it's no good to me if it won't stay in tune, so what's to lose?"
In your case, it sounds like you need new posts. Can't hurt to replace them on your own. And when an Edge is set up correctly, NOTHING stays in tune better!