I am using the same router, and i checked my speed now after reading your blog, my speed is 10Mbps and i have kept it inside my home, and my apartment is on ground floor. so the bar shows just 1 dot.
My suggestion to you is to long in into your roter http://homerouter.cpe/
or 192.168.1.1
and go to the Internet
if the NETWORK MODE is AUTO, change it to only 4G, than only 3G and check, sometimes u will get a better speed on 3G also.
All the best