Don't you just love it when you find new information that shows you that the way you have been doing things for 20 years is really not the best way? Well, actually, I do love it. Better to find out late than never.
This article gives some really good insights into the use of your fill light. The ideal placement may not be where you think it is. Take the time to read this article by Art Adams, and you may improve your lighting design tremendously.