The skull being more proportional to the jaw's my favourite thing about the design.
I think you've got it backwards frankly speaking. I like Stompy because I like different takes, but it pretty much falls under all of your criticisms, not the Aliens Fireteam Elite Drone.



Picked the above images for clarity, look at the size of the legs and arms in comparison to the torso, or the back pipes and shoulders or even the head, not just the jaw.
All are much larger that usual, to give it a much more monstrous appearance, I think it works, but it is nowhere near as slight as the Alien typically depicted or human in silouette.