Basically, the hydro tester followed the requirements, but did not follow the "common practice"....
The "round out" id specifically identified for HP tanks, but not so for LP. Even if done, the problem can be that the tester did not let the tank "stabilize". The round out says 30 seconds MINIMUM, OR UNTIL STABILIZATION. It is more than likely that the tank, due to the galvanized coating, was still in "flux" at the 30 second mark, and they stopped the procedure. There is absolutely nothing I can do about it.
It seems, however, that my LDS is now no longer going to be using this facility...