Have you already reviewed the two available work around solutions?
Namely, the
Browser Cache Feature implemented directly in FFF and NSAPA's (experimental)
proxy system.
FYI, I continue to not see any problems with light ffnet downloads and updates. I think the people seeing issues are on networks that, for whatever reason, CF has flagged for additional checking.
Based on past experience, if everybody were having problems, we'd see a lot more people complaining.