It's really weird because I'd mark my jig perfectly fine, would pick up my jigs/ and subtle movements and then from no where my buddy would yell to reel and show me the chase mark on his finder after the fact. I'd mark the fish peeling off bottom eventually too but my mark was always delayed... maybe he has a fast processor or something idk but I guess I'll try a new ducer as mentioned... if not I'll just grab a Marcum