Interesting that HTTP/1 is better with packet loss, and also that Firefox is reliably faster than Chrome.
Re: pipeline was never used
This is actually not true, it was not used most popular browsers, but Opera (the original one) utilized pipelining since version 4[1]
[1] http://www.operasoftware.com/press/releases/desktop/opera-4....
HTTP2 is garbage.
Also highly recommend h2o web server over nginx: https://h2o.examp1e.net
Best server for http/2 server push!