I'm not sure it will carb any better going through the liquid "out", but I don't think it can hurt either. I would first purge the oxygen out of the keg using the gas "in", so that it's all gone before you start bubbling through the beer and stirring things up.
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Primary #1: Umlaut my Kolsch III #2:Empty
Secondary #1: Russian Imperial Stout#2: Empty
Kegged: Irish Red, Sunset Wheat clone
Bottles: Piker Liker Porter, Dubbel, Carmelite Tripel, Belgian Tripel, Apfelwine (Windsor)
On Deck: Dusseldorf Alt, Queen of Hearts SMaSH, Honkers Ale wanna-be, Stella clone, Oktoberfest
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