Woodies are basically done flying 20 minutes after shooting light starts.

Woodies don't like to "decoy," per se. They pretty much are going where they are going to go regardless of if you are there with a decoy set up. However, if they land close by and are on the water they tend to like swimming up to the decoys, though.

Best thing to do is find little ponds or swamps with oak trees and they'll be close.