Your pictures are definitely disgusting as are those fat suckers. It almost turns my stomach to hunt them out. I spray every year or use granules containing imidacloprid and still have the #%*& things. You did not state what you use to spray on them. I have used Bayer Advance Rose and Flower spray and the kind you mix with water and Season Long granules by them as well as spraying other stuff later on. Nothing seems to work too well. Jim Hedgecock uses something called Fertilome Tree Drench. Others use things I never heard of nor do I have an agricultural card.
Any suggestions? Last year I think I did not use the stuff twice which may be the reason. I do go on the hunt weekly and root out those creepy things.