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yeah - some longer subs and less stretching will be helpful. Your flats do need to be from the same optical system though with the same camera orientation etc.
I always found taking flats to be a pain, as I never left enough time to do them on the night I took the light frames and would do them the next day with the white t-shirt trick - but more recently I have been using my iPad as a white screen and just holding that over the end of the tube and firing off 10 or 15 flats after my imaging runs. That way I don't need to keep the camera attached to the scope until the next day.
keep the piccys coming!
Adam
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