You can upload a 20Gb to YouTube. So those sizes are fine, just leave it working.
There's no way around long form content and data rates. It's just math. So you either live with those sizes or you lower your data rate to get a smaller overall file size which will impact image quality. Until h.265 becomes a usable standard this is the encoding dance we have to do.
Ryan Holmes
http://www.ryanholmes.me
@CutColorPost