Do you keep the bits that only started working in the last week of a Fringe run?

I’m wary of giving the final few shows too much authority just because they’re the freshest. If a section struggled for most of a run and then suddenly clicked near the end, do you treat that as proof you finally found the version — or assume the audience/context may have helped and test it again before rebuilding the show around it? I’m trying to separate “this got better” from “this had three good nights at exactly the moment I desperately wanted it to get better.”