I don't have an Accuquilt, but I do know that when that many seams meet, it is likely that they won't lie flat. Some people solve it by ironing all the seams open before they sew them together. Others take a piece of board and put it on a solid surface, then put the seam on top of the board and then use a hammer to beat the seams flat. I'd cover the fresh fabric with something before hitting it. Or there are others like me that know that just iron the center as good as possible, then go ahead and quilt and the problem disappears when the quilt is washed and it fluffs up a little bit.