Hey, You are quite observant even when running. Yes the rock mapped as SW of 4 is directly south, I had mapped it from memory, not a good idea. Someone else mentioned the distance from 9 to the trail. That really subtle feature for 9 could certainly be off by 20-30 meters.
19 apparently was hard to see, as some others said they were there but did not see it. It was not particulairly low or close to the boulder.