on my BH450se with the stock TX/RX i was getting horrible gltches installed the ferrite ring and it was no better.

i just rerouted the antenna wire by wrapping it around the skids like how it comes from mike no plastic tube nothing and the glitches have gone for now lol

i think its just getting lucky moving things around changing the way your picking up the rf noise and trying to eliminate any excess in your case the frame is either focusing and or magnifying the issue. ferrite rings only work so so but its worth a try ESC motor wire routing id move it all slightly you should get it.