If you have the extra time, pour the corn syrup mixture in the pan first and then lay the pecans out in concentric circles. It takes a few extra minutes, but it makes a pretty pie.
I still find myself struggling with an appropriate cooking time. My dad always says that it's supposed to jiggle, but not like jello jiggle. I don't eat jello. And, he's always telling me this over the phone, so I have no idea what his idea of a jiggle is. It will definitely set when it's cooling, so you do want it to jiggle a little, but not too much.
Adapted from epicurious