Running in Disc mode the Omega chirps and TDI jumps around over 70 sens. Also the tab that shows iron, foil, tabs, etc. jumps around. I have the 11" DD on detector. Everything calms down under 70 sens but it goes crazy over 70. I read where it will stabilize after you start swing the coil but it does not. I have used the ground grab and that does not help either. Any ideas.....Thanks