Just out of curiosity mainly are you running the 4s version or the 6s?
Also I’ve just been looking at the info on your OSD from the video you posted. Your LQ looks extremely poor to me… looks like its constantly on the border of failsafe… it never goes above 8. Too put that into perspective my Crossfire setup never goes below 200 always between 300 and 200… wonder if there is an issue with your RX and due to the issue its causing interference on your video feed 
Also another consideration is your GPS unit. But I can’t see that causing interference I’m assuming you installed that yourself what UART did you use?