I recently finished a 32" square wallhanging and am very pleased with it. However, when it hangs, it becomes all wavy, not flat. The center areas are more heavily machine quilted (with mini squiggles) than the borders. I wanted less quilting there, so the fabric design shows more clearly. I laid it on the carpet overnight with a light masonite panel on it and it looked good, but after hanging a few days, it's all wonky again. Is there any alternative besides adding more quilting to the less quilted areas? I don't want to do any heavy pressing as that would spoil the pop of the quilting.