I'm in the same boat, changed my ISP, now I have fiber, changed my PC, changed monitor, mouse, keyboard, headphones, power sockets for PC and monitor, windows re-install. Nothing worked, my ping is as low as 3 sometimes, mostly under 10 but I have this weird delay in everything that's on the screen and the sound, and it looks somewhat blurry when moving the camera around fast. On my screen it looks like I shoot the enemy, on the kill cams it shows that I missed.
Sometimes the game feels great, mostly late night, and when that happens I am frying, but I can't stay up till 3:00 AM to start playing too often.
I have just ordered my R3 to see if it helps, I don't have much hope.