This might seem like a dumb question, but how are your mirrors normally set? Most folks I know seem to like a healthy chunk of the side of their car in the mirrors.
I normally set up with my head just brushing the glass in the side window, then set so the edge of the handle is just visible. For the other side, same idea, but with my head across to about even with the rear mirror. Get a far wider view doing that, and blind spots are almost totally gone in regular use. Do have to be aware of the limitations when reversing though, you don't get a view of the few inches around your vehicle without moving your head.