I never worry about that kind of thing. I hunt about 10 different holes, and for no more than about 3 hours at a time, and never hunt the same hole more than 1x per week. Like I said these are high pressured public birds, and I am hunting small roosting spots.

I hunt by going into the hole, lofting the birds before light, and shoot what comes back. I always sit on the X, and never around any competition. My main focus is not on burning out my little spots. I almost always shoot between 4- and 8 birds for the boat. Never get really nice long consistent shoots.

My main focus areas are:

1- On a spot where the ducks haven't been shot at for a while
2- Well hid
3- Decoy placement is N/A just get them out where the ducks can see them.

#1 is more important than the other two by a lot, but only for the way and places I hunt. As far as decoys, I like the scaup because they are black and white and stand out from a long ways away. I like the teal, because a) they are my favorites to eat, and b) you can fit a whole bunch of them in a cooler. I bring pins and mallards because they are the most common.