This directly off Panasonic’s website
Fast, comfortable communication of high-volume data. At a theoretical maximum transmission speed of 190 Mbps, the system is faster than a wireless LAN system, even when comparing actual system speeds. Also, a simple speed measurement function*1 shows the communication speed between Master and Terminal units.*2 The speed is measured by simply pressing a button on the Terminal, so you can easily find which power outlets give you the highest communication speed for a more comfortable network environment. You no longer have to feel frustrated because of slow data transmission.
*1 The indicated speed is only valid for the moment at which it was measured. It does not imply that the indicated speed will continue.
*2 It does not indicate the communications speed between Terminals.
The first caveat is the most important. The speed does not indicate this will continue… panasonic is stating this. This means some other device is pulling power throught that exact circuit, the device will drop netwrok connection.
So I dont’ think a new router will increase your streaming performance. I believe you problem lies in the fact that you are using inline-power for networking. All the specs on panasonic’s website talk about max theorical. It does not talk about sustained throughput. With streaming we care much more about sustainable data transmission rate.
I hope this helps a bit.