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[APML] Need some help in photoshop!



I know this may be basic processing procedure to some, but for me it seems to be a road block. The problem I'm having is when I make the basic levels adjustment so the histogram looks like the ones in Chuck Vaughn's example of proper processing, the background is still too light. Is there a way to darken the background with out 1)destroying the histogram and 2) maintaining the fainter detail in the image. In this case It's a 3 image stack of M81. It's a 2hr a 1hr 37min and a 50min blended in PW. When ever I get the background dark enough the fainter part of the spiral arms is obliterated. Can someone give me some pointers on this? I've identified it as one of my major processing downfalls.
 
Thanks! Jim Ives