That didn't work. They're still exactly as fuzzy as before. I also tried removing all of the layers and re-adding them with the Place... feature which positions them at 0,0 I believe.
Rasterizing does not fix it either.
Below, I have made a new canvas using the settings shown. See what happens when I use Place and position the layer at the origin... Then I opened both the screen shot and the same canvas as below and did a Select All > Copy > Paste and got a much better result.
And then finally, I show both of the layers together on one image... What appears to happen is that when you drag an image or use paste, the application selects an arbitrary size for the layer instead of making the layer the size of its actual contents. As you can see, the pixel copy/paste is many times larger than the image I dropped in with "Place...".
Is there a way to make them drop in at their original resolution?