Were you shooting film? Or HD at 24 or 30fps? (as opposed to 23.98 or 29.97) If so then yea, you'll probably have to do a pull down. Not sure how to do that with Final Cut. It's been a long time since I've done double system.
If you're shooting video then your problem is something else. When you say it's "getting off over time," how much time are you talking about, a minute? An hour? By how much?
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