When you say "like a rock" is it really going down fast? or just diving below the surface when you retrieve? Also, what are you using for a leader? Any
snaps or clips? What # test? It's definitly a possiblility you've got a dud, in which case I'd recommend you send it to Gibbs w/ a note (you'll probably get a new one) but I just want to be sure it isn't something else first.
Thanks!