R7000 - Bandwidth issues

I am having issues with my R7000 AC1900 router. Degraded bandwidth, inconsistent pings, packet loss, etc. I have 150 MBs download speeds on ISP. I have ran speed test.net and had results from as high as 160MBs to as low as 1.49 MBs for download speeds. This changes like the wind, very inconsistent. I play online games, and have pings from 60 ms to 3500ms. I have tried trace routes that have and have timed out to www.google.com and my game server www.mwomercs.com. I tried ping -n 20 8.8.8.8 and have had 20 of 20 packets delivered and as little as 3 of 20. I got fed up with it yesterday and tried to fix it. On my desktop, which is ethernet wired from R7000, I was getting around 4.5MBs download. At same time, I tried my wireless laptop, and got 120MBs download. I don't know why this happened.

I then took laptop into living room where modem and router is, cut off the wireless, and connect to router. Laptop wired got 4.5 MBs. I unplugged ethernet and turned on wireless then got 4.5. I tried again a few minutes later and got 120ish. Then took laptop and connected straight to modem, byassing router, and got 120 MBs. So I was thinking maybe bad ethernet cable. Tried new cable, from router and still only got 4.5. I took old cable and connected straight to modem and got 120ish. Long story short, I gave up, rewired everything as previous, returned to my desktop, and now desktop is getting 150MBs. So now laptop and desktop are both good. A little while later, desktop drops back to 4.5. I online game competitively, and the inconsistent jumping of bandwidth, ping, and packet loss makes me very unreliable as to should I lead target,trail target, or directly on target.

I tried QOS both enabled and not enabled. I am at wits end. I spent a lot of money to get a solid "Gaming Specific" router, pay for best ISP, and cannot utilize it. Is this a router issue? ISP issue? Combination of both? I am just so frustrated I don't know what to do to fix it.