One other solution for "rabbit ears" on Kitchner stitch is to pass the outermost stitch from both edges of both needles over the stitch next to it working inward. This will eliminate four stitches from the total number you have to do Kitchner stitch on, and get rid of the boxy edge.
I have rather non-pointy feet, so when I'm doing top-down socks I'll stop my toe decreases one or two rounds earlier than the pattern suggests, do the rabbit ear fix then Kitchner stitch the rest. So if you're supposed to decrease down to 16 stitches (eight on both front and back), I'll decrease down to 24, pass 4 stitches over and off needles for rabbit ear fix, then Kitchner the remaining 20 stitches. This gives a nice toe that fits my foot.
Hope this helps!!