I've wondered the exact same thing. It sure seems like cold crashing would make the bottles take longer to carb. Perhaps this is something that should only be done with kegging, or someone that doesn't mind waiting longer for bottles to carb.
Primary: Strawberry Kiwi Wine
Wifes Secondary: Strawberry Wine
Kegged: Belgian Wit, Belgian Chocolate Stout
Drinking: Irish Stout, Ed's Apfelwein, Chocolate Stout, Holiday Spiced Ale, Irish Red Ale, Watermelon Wine