I have seen a few other threads about difficulties in getting the brake lines completely free of air when bleeding. Regardless of method used here is a final step that you can take to ensure all of the air is out. Tie or wedge something to the lever/pedal to hold the brakes firm and leave it over night. Release them in the morning when you are ready to ride and they will be firmer. Just make sure that the fluid is topped off and covers closed.