This one (which you explained well)
This one sat at -2 for awhile; I was confused by that.
This one also sat at -2 for quite awhile, but seems to have come up recently.
...huh. On the whole, most of the severely-downvoted posts that I remember being confused about, have since been upvoted to low-positives. I had no idea. Thank you for prompting me to take the time and attention to notice that.
I guess, then, a more direct question I have is "how do I bring my karma into the 90%'s, instead of the low 70%'s where it is now?" - I've always felt that percentages are a better measure of my worth to the community than numbers. (Alternatively, if this is an incorrect assumption, then how do I update so that I see the percentages as not that important?)
Dude, this is not worth stressing about. Write what you want and let people react how they will. Many of Eliezer's posts are heavily downvoted.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.