"Repeat after me: "starch is my friend, starch is my friend.."
That and one little trick. When you're sewing across the points, remember to allow for the turn of fabric taking a bit of space. Sew about a hair or two from the points. Then when you open the seam and press it, the point will be sharp and not cut off."
My grandma taught me that one!! She was a perfectionist. That said I'm not a perfectionist, I do admire those that have perfect points!! LOL!!