What do you shave with? If you're an electric shaver user, try one of the Braun Syncro 75XX models. If you use a blade try the Mach3 Turbo.
If you have a really heavy beard you may not be able to totally get rid of the shadow. If you have a suitable skin type one or two laser treatments may help significantly.
I recently had my beard treated with the Sciton 1064 Nd:YAG laser. After one treatment it takes me 10-15 minutes less time to shave my beard. What a difference. The cost was $150. I get a second treatment in 3 weeks.
RJC2001