The first quilt I made that had points was awful. The stars were all blunt ended! The pressure foot I was using measured a 1/4 inch that was too "scant" so all my seams were too small. I have made about 4 quilts with stars now, and they look better each time.
It might help to choose one favorite block and keep making it till you get it perfect. Everything you do is subject to change if you find a better way to do it: Finer thread, starch/don't starch, prewash or not, different rulers, etc.
Probably the biggest thing, though, is perfecting your 1/4" seam.