Er, looking through the previous form of the gallery, I'm not actually seeing any duplicates. Different versions of the same picture with excessively minor changes (things as small as removing nipple covers from a character in the background), yes, but no actual duplicates—that's the artist's fault, and I'd personally say that it was good of you to post them all. And you especially lost a lot of important material when you cut out all of the non-cum versions.
That being said, the original gallery could have been organized better, with all of the related images together so that their minor differences were more apparent.