I think you've done a great job.
Remember the DSLR (or a CCD) doesn't have the dynamic range to give detail in the bright and dark portions of the nebula. You need to blend images exposed for bright and dark portions together to give the "whole" picture. Just stacking them together isn't enough - you need to merge them together in photoshop! Just remember that every hour you spend in the field must be matched by another hour (or more) in front of photoshop.
DT
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