quiltylori

Hi everyone...I'm making a round table quilt. I have the top all put together and I'm ready to put the batting and backing on it. I am planning on using the two sided fusible batting (never tried it before), but I am concerned because the center of my quilt does not seem to lay flat. All the points from the 40 triangular pieces meet for a circle in the middle and pucker up. Any suggestions on how to get those tiny sewn pieces to lay flat. I will try to get a picture so you can see what I'm talking about.

Thanks for any help you can give me.