Out of curiosity, are you also using the cloud CDN?
https://cloud.google.com/compute/docs/load-balancing/http/us...
https://cloud.google.com/compute/docs/load-balancing/http/us...
I use CloudFlare. They handle generating a SSL certificate, can have a CNAME at the APEX, full-site static caching, 301 http => https redirects, etc.