Hey, Mark. It's looking much better! Here's something I do that helps me get that egg shape I'm looking for from spine to bottom of the handle:
I get the knife to the same condition as you do like so:
Then I use the flat platen (or you can use a rasp/file) to knock the corners completely off like so:
So that you get this:
I'll go ahead and take the edges of the scale down to right at the finished thickness I'd like. I usually leave the "peak" of the side of the scale just above midline in the handle. Not so much a perfect oval when it's finished, but rather tear drop shaped.
Then I go to the slack belt and round it out. If the scale still seems thick, I'll knock some off of the "peak" before I blend it.
So you end up with something like this:
Then again, it all depends on the profile you want. For my smaller handle EDC's, I like a smooth tear-drop or egg-shell shaped handle. For a full handle, I like a bit more contour, and maybe even a palm swell:
Anyway, keep playing around with it, and you'll find something that clicks in your hand and in your mind.
--nathan