What avatar said...
You'll start out trying one way, then, after a few days / weeks you'll find that everything is suddenly in it's logical position (logical for YOU, that is).
We ended up having most things categorized (like avatar), and probably a 40/60 front/back distribution, although we never measured it.
one thing you MUST try: keep left/right pretty close to 50/50... that makes a HUGE difference in ride quality.