RT-AC86U Wan/Lan Speed problem

I bought an RT-AC86U this week. I was going to setup an AIMesh network with my older RT-AC1900P. I set everything up and noticed my internet download speeds using a few different speedtest sites was slower.

I am using Comcast/Xfinity Cable Internet with Gig speed. I tested my internet with a PC directly connected to my cable modem. and get 950/42.

So I went back to the beginning and reset both my RT-AC1900P and RT-AC86U to factory. Configured both exactly the same (with default...

RT-AC86U Wan/Lan Speed problem