Start changing your bias. Go to 0 first to see if it will work (sometimes it does). Then start making it larger. There's a writeup on shadows here in the forum. You can find the link up in the banner. Odds are, you're going to have to go to a different lighting scheme (Environmental Lighting) or a glowing sphere with GI to get a result you're going to be happy with. This is because you have objects which are in tight proximity to each other. Soft shadows work for some scenes but are limited in others. -Kix

-Kix