So I have an RT-AC87R that I use. It is located one room over from our living room on the other side of the wall closest to where the xbox one is. I don't have an easy way to run an ethernet cable to the xbox, so wireless is my only option right now. I have a 155/15 connection from RCN, I run a speed test wired and actually get 195/20 most the time. Over wifi on my macbook pro I can get 180-185/17-18. My iPhone 6s Plus and iPad air 2 can both get about 170-175/17-18. So I know my wireless is capable of delivering fast speed. However when I run a diagnostic test on the xbox one I am only getting about 35-40 down. I once got about 107 so I know the xbox is capable of getting faster speeds too. I am using the 5GHz channel on the router, I do have the optimize for xbox one checked in the wireless settings for the 5GHz channel. Is there something else that I am missing to get the best wireless performance out of the xbox one? The xbox is about 6-8 ft. in a straight line from the router with one plaster wall in between them.