are you using a walking foot to do your quilting?
I know my first quilt I THOUGHT I knew what I was doing. I basted my quilt and there were NO wrinkles or puckers in the back then I used my regular sewing foot to quilt! Yea I should have taken advice from others to get a walking foot it makes quilting look 100% better from the back. My next quilt(I bought a walking foot) had NO puckers in it!!