reevesfarm, a trick my quilt teacher showed us is, if you are making flying geese withe the squares on each corner of the rectangle draw a line across when sewing start on the line 2 or 3 stitches then very gradualy sew off the line to wards the point and then keep this sew line staight along side your drawn line till you get to almost end and gradualy move back to your line.
It gives a little more in the middle when you press.
Retrim if need be.
It realy works!
Gale