check this link below, this man really knows his stuff.
i know you don't have euro lights but this info will work for you.
have you compared you lights to a car similar to yours?
perhaps you might try a "whiter/brighter" [standard wattage]bulb, such as 'philips vision plus'[euro], OSRAM silverstar [euro], SYLVANIA silverstar [u.s. 60/70 watt].
do you have fog lights?
if so try using those at night to boost your light output. i use them to help.
do you have xenons?
sometimes they look like the are 'short', very broad but short.