You can try, but i doubt it will help and with 71% something is interfering badly, with your Router, well if you where told 350 should be enough i wont argue, but i would never buy a 350 myself :D...

Okay i am 95% certain your using the 2.4Ghz and not the 5 Ghz, that is why you have low speed, as to the freezes, could be your psu does not deliver enough power, and with everything your running in...

Okay from the gibberish it looks like your not on the same subnet as your Router unless you did not post everything,
Could you click on the Windows icon then type cmd, when it appears right click...

Okay i think i speak for everyone in here DO NOT DO THAT AGAIN, if you want us to help.
:D

The Realtek 8812AE chip is notorious for being slow.
Okay first i would check if you are connected to the 5 Ghz Wifi, or 2.4 Ghz
Second from your spec page i see no wireless devices, or Bluetooth,...