How about a nice set of HELLA lights? You can blind the drivers behind you!
Have the old lady ride backwards?
Just kiddin'...I'm a smart-ass at heart.
Are you riding a standard? touring? what?
Are you running a Run-Turn-Brake?
If you've tried the RTB and changed to a higher wattage bulb out back, obviously, your only alternatives would be to add more lights out back, or change your expectations.
Some have added hardbags with built in lights, others have added trunks with lights. You can also check with 3M for retroreflective films that will help with visibility out back... depending upon your paint color. How about some LEDs?
As far as the headlight is concerned, a lot of people are changing the headlight bulbs to PIAA or Sylvania bulbs. Use the search forum tool for bulbs that others have used. Some folks, myself included, are adding 'down low' lights or TRI fog lights to increase the lumins out front.
Good Luck