North west / B.
Dont have exact coords sorry, However tried starting both in (the landing platform of the cave/at the crabs) & out (near reset spot at the teaks) of the cave, it can initially path into cave/onto the tile.
I was able to get an issue free ~2h run when using "Attack active crabs" just before (Previously used Wake crabs, Hop&wake, Hop&attack), however seems odd that would influence the webwalk.