What size hooks are you using. I have found that crappie have really big mouths and sometimes the small hooks don't catch as good as the bigger size one's do. You may want to use the sickle hooks they are really sharp and give a wider gap for better hook up. The worst thing a fisherman can do also is to fish with dull hooks. A old time test to see if a hook is sharp or not is to drag it across your thumb nail if it doesn't stick in the nail and just slides across change hooks as it is not sharp enough.