Quote Originally Posted by Michael R 1974 View Post
Martin, pre-flashing will decrease local contrast and/or total contrast, which is the opposite of what OP is looking for with a low contrast negative.
I have no idea what his neg looks like. I only know that for a normally exposed foreground and a low-contrast over-exposed background I can get enough tone and variation in to the background most easily by flashing, often at a high grade. If his neg is uniform and thin then indeed, this technique isn't going to achieve anything.