I don't know if you would really call it another migration or not. I think that now the migration has begun and there are just "flight days". Some are better than others. I still have not perfected predicting these or getting the timing right for them either but when you do hit one there is no doubt about it.
Ok, I don't usually do this but this one time I will give the cooridinates of one of my best secret spots. It really is an awesome spot. There have been ducks there EVERY SINGLE TIME I have been there, regardless of the time of year even. They are just there all the time. Limits are easy. There are always other people there too but none of them seem interested in hunting. Oh well, it's thier loss as far as I'm concerned. Just don't tell too many other hunters about it cause it really isn't that large of lake and I would hate for all the birds to get run off it forever. Here ya go -
38 38' 08.88"N
90 17' 26.16"W
If it is too crowded there you can try this spot, it's not far away at all and also always holds ducks -
38 38' 20.87"N
90 17' 13.17"W