There is a great thread on Crappie.com related to water temp and crappie action. I don't have it saved as a link, hopefully someone will post the link to the thread.
Remember the basics, crappie are predators and hunt in low light conditions. They are also a food source, and they are prayed upon in low light conditions as well. Makes them skidish at times. Crappie also like an easy meal, find their food source and fish around it. At this time of year, with the unusual temps they could be just about anywhere. However, I would start about half way down a drop off. They will be facing the drop off, actually their nose will be so tight to the drop off you could pull your jig right past them and they wont even see it. Best way to fish them is from the lake side, cast up to the shore and bounce your jig down the drop off, slowly.
You already saw the technique for crappie holding tight to trees.
If the crappie are suspended, pulling cranks or spider rigging are your best options.
Realize, crappie move around the lake as the seasons change. They have preferred waters for spring, different waters for summer, different waters for winter, and they have preferred routes to get from one place to the next.
The only way to learn is to spend time on the water. We ALL went through the same thing. What works for me today may or may not work for you on your body of water.
HOI Crappie Club
Where family and friends come to compete for a little more than bragging rights.
Quick, someone teach me how to fish so I can win this tournament!!!