i think you might have better results if you applique a circle onto a 5 inch square.
make 9 of them with the red circle and then make 9 of them with the red background.
then cut the blocks into 4 and alter the sections to form the pattern.
its very difficult to sew curves let alone on this size scale. when i was during the 4 inch NY Beauties for my IRR center i wanted to shoot myself.