Background
I am aware of the reasons reputation has a floor of 1, and I think that's just fine. Occasionally I will downvote a post whose OP has a reputation of 1. I'm OK with how the downvote will only affect the post's score and not the OP's reputation. For reasons I do not understand, some of the terrible posts which I downvote will later get an upvote. (These feel like pity upvotes to me.) Since the downvote won't retroactively change the OP's rep, now they have a reputation of 11 but their single post (and it's usually a single post) is at e.g. +1/-3.
Occasionally I will come across the post again in the course of my normal site activity. If it hasn't been edited, then I can't reverse my vote. This is a little annoying but, in the grand scheme of things, small. If it has been edited (in which case I'm more likely to see it again, due to the bump) then I will typically undownvote and redownvote for the express purpose of making my vote "count". The first time I did this was out of spite, but now I also worry about them getting out of the new user restrictions (most notably, answering protected questions) just because of this bad post.
Of course, if I come across the post again but it's been improved, or someone has pointed out why it's fine after all, I'll usually reverse the downvote without redownvoting. Sometimes I'll even upvote.
I recently realized that maybe I was exploiting the system a little bit, so I guess the essence of this is...
Question
Assuming this specific sequence of events has occurred:
- I downvote a poor post
- The post is edited (not by me)
- I naturally find the post again, and it's still bad
Is reversing and immediately redownvoting OK? Should I stop doing it?