I’m not opposed to downvote limits, but I think they need to not be too low. There are situations where I am more likely to downvote many things just because I am more heavily moderating. For example, on comments on my own post I care more and am more likely to both upvote and downvote whereas other times I might just not care that much.
How about the boring simplicity of having downvote limits? Maybe something around one downvote/24 hours—not cumulative.
If you’re feeling generous, maybe add a downvote/24 hours per 1000 karma, with a maximum or 5 downvotes/24 hours.
I’m not opposed to downvote limits, but I think they need to not be too low. There are situations where I am more likely to downvote many things just because I am more heavily moderating. For example, on comments on my own post I care more and am more likely to both upvote and downvote whereas other times I might just not care that much.
This is a solution as well; it is not clear to me though, that it is better than the solution I proposed.