Gelatin is usually more effective if added into the beer after it is already at a cold temperature. So crash the beer to cold temperature, add the gelatin, wait 2-3 days for the gelatin to settle, add hops. Bear in mind sometimes a heavy dry hop will cloud your beer up a bit again. If you are really adamant about the clarity you can do the gelatin after dry hopping. It can pull a small amount of the dry hop aroma down with it when it clarifies, but that becomes a recipe adjustment of adding enough dry hop to compensate.
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