While doing runs on this level I found a pretty substantial new time save where you aggro the head above the gate to get it to fly over the top of the wall which allows you to get to the valve much faster. Unfortunately the heads have weird AI and getting the head to fly over the wall, let alone quickly, is pretty inconsistent. For some reason sometimes you can even get two to fly over. It took a few hours but I got a run I'm pretty happy with using a new route I came up with. Head could have been a bit faster and in a better position after activating the valve to save me having to going back around to the stairs. but I'm still pretty happy with this run.