@portofacil and @brianjking Thank you very much for your reply.
Why I considered SPDY when there's HTTP/2 is because of this article:
https://deliciousbrains.com/hosting-wordpress-yourself-ssl-spdy/
But it's only yesterday did I notice/read that SPDY is an experimental feature and is now almost deprecated. So that's all cleared now.
All these attempts were made while trying to reduce the load time (of HTTPS). Tried bytecheck.com and compared my site with a few others. Their time-to-first-byte are way superior to mine.