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". This is especially likely on Puzzling, where people will often blindly add spoilers to answers without checking for quality.
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?