Nice plugin, I try to push it wherever I see someone trying to replace jQuery with a CDN version :)
Q: why are you doing the is_ssl test yourself, when WordPress does this already in the is_ssl() function? What you're doing (since you fixed the port number!) isn't any better than what WordPress is doing itself.
BTW, it still won't work behind a reverse proxy (nor will is_ssl()) but there are host-specific workarounds for that so you shouldn't join that game anyway.