Same here. I am using Turtle Beach PX4 with chat cable to controller. Even a low breath with mic boom 6 inches away picks up. The camera microphone is just as bad. They need a MUTE option and a sensitivity setting badly.
I have the same issue with my Turtle Beach XP400's. With chat cable connected, everytime I press a button/stick or even tap my controller, the "chat" speaker shows up on screen, even though I haven't said a word. Can't wait for bluetooth update to get rid of this weird issue (btw I am using the official chat cable from TB)