I only use Elmer's, though not as much as you're using. It's not necessary. What you're doing is not allowing a little give when you quilt it. I lay my backing on carpet and pin all around, then I lay my other two layers and Stretch them out. I will glue one of the ends about a foot deep. I will use a long circle 8 motion trying to have at least 4 inches of negative space. I then pin that portion down and roll the top and batting, separately, to that point and begin again doing about 12 inches. When you have 100% coverage and no negative space your quilt won't have give.