Thanks for the good archeology and covering!
Bulldozer had some revisions, presumably to counter backroutes. Your Bulldozer replay is for an older version. I've attached Bulldozer from February 2017 Lix 0.6.27, this is the newest version before we cut Bulldozer from lemforum entirely and replaced it with Evacuate the Sinking Ship.
Bulldozer has always lead to extremely precise solutions. geoo designed the map to work with less precision, but these details are hard to find.
-- Simon