Often the problem is the way the seams are pressed after the block is made. The point is on the bias and can be easily stretched out of shape. No steam and straight up and down press and ho scrubbing of the iron. A clapper can help "set" a seam to stay put. I have heard of some hand piecers using a eighth on a seam to elliminate the bulk at the point or pressing the seams open for the same reason. All things to think about when points are intersecting with many seams.