I agree with Vincent -- that's some development technique! What was the agitation pattern? As for the exposure -- did you meter, or guess? If you metered, what part of the scene did you meter, and how? I'm looking to learn...
I cheated and took a "Polaroid" with my DSLR. (But, to be fair, i did take a few averaged spot readings before confirming it on the DSLR) My agitation pattern is a few inversions every 15 minutes.