Some off the wall stuff.

I was poking around in the old FAQ and I came upon this:
"Another good tip is after you've bled the brakes as best you can, tie the lever hard back against the throttle grip with a cable tie & leave overnight.  In the morning you'll have absolutely no air in the system.  Don't ask me how or why it works, a bike mechanic friend told me about it years ago.
Phil S."

OK Phil I'll give it a try.
Bill
 

Sometimes yes. Sometimes no. Depends where the air bubbles are trapped. 

I've done this before when I had time... 

Also helps to tap the calipers and brake lines with a 10 mm wrench. 10 mm only!