Will VMF automatically take advantage of the new behavior? I'm running VSR with the defaults, as part of VMF, with the addition of telling it to use a PYEC. I'm particularly interested in this section of your post:
fought 1 shadow bat, 1 shadow guy, 1 shadow prism, 3 shadow slab, 4 shadow snake (10 normal shadow monsters)
fought 1 shadow cauldron, 3 shadow matrix, 1 shadow spire, 1 shadow tongue (6 shadow bosses)
spent 3 shadow bricks.
found 1 shadow bread, 6 shadow brick, 3 shadow flame, 1 shadow fluid, 1 shadow glass, 3 shadow nectar, 2 shadow sausage, 7 shadow sinew, 3 shadow skin, 1 shadow stick (net gain of 25 items)
And ended up with 180 turns of Shadow Waters.