Interesting find on the ABS delete unit.
re the heat difference across the axles I thought you ran without the ABS/VDC connected (fuse pulled) as seeing a difference in temps cross the calipers says that the VDC is still working.
The rear biased valve , is this an extra drilling (line) in the new block assembly to allow a single line to control the feed to the 2 rear brake line?
Found the website and the tech drawings , good piece of kit , good find.