Almost impossible to say if you are doing something wrong or what to do as I am not there with you. My first question would be are you sure there are crappie where you are fishing? Any locals that you know that can help you pinpoint where the crappies are? You can have the best looking jig and work it perfectly, but you wont catch what isn't there. For the most part, catching crappies is pretty easy... finding them is 95% of the challenge.
Maybe post the location and ask if a member here that is from that area can help you out, that would probably be best.