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I would wait and bring util down just so you get a little extra boost. couldn't hurt. I never get a pre-approval from discover, they just always like to recommend stuff for me.
Don't know if you've seen some of the other threads, but did it actually say "Congratulations you were pre-approved for..." or did it say "Recommended offers" the site will no longer say "Sorry we couldn't find any pre-approved offers for you" unless you go to the "see all offers' section.