wmscott,
Is it accurate to say that the extent of your proposed flooding is much less than the flooding seen in the Genesis account (ie the entire surface of the earth covered).
I think what we are searching for is the source of water that could cover all mountains including Mt. Everest. From what I remember the extent of your proposed flooding is much less than this. Although your model seems to have sudden flooding events which are consistent, but these seem to be local instead of world wide.