Sounds about right to me Trevor, although some of the DSLR aficionados will chime in if it isn't.
What does the finished flat look like, what sort of readout do you get when you run the cursor from the middle to the edges?
Oh, and I just re-read your post, you will need them at the exact focus point, and focal length that you capture at, so in my case I normally shoot them immediately after I finish imaging. Same with darks.
Gary
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