Advice on excluding a fake-out when price drops

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I'm creating an indicator that helps me see when I should consider opening a buy position. For the most part I'm very satisfied with how well it works with my system. However, the one situation I can't get my indicator to downplay is the fake-out that happens about 1/3 down on a price decreasing slope. It reminds me of the back side of an Elliott Wave 5-3. Any ideas what to look for before or during this this fake-out? Thanks!