I agree completely that the difference in teams means that you cannot rely on symmetry to balance a map, but I disagree that maps with symmetry don't work.
With UTCS my aim was to acheive balance within each half. Symmetry just makes the map layout easier to remember and works on the familiar 'staged combat' theme.
The other goal was to keep it as small as possible, as an alternative to ATCS when you have only 4-6 people on a server.
However, small maps will always favour humans, and because UTCS is so small, the first versions of this map were very biased towards humans. Humans are weaker the further they get from base, aliens can't evolve in close proximity, and aliens often survive a destroyed base by stealth and backup eggs. On the other hand, maps with a lot of vertical options let aliens take advantage of their better mobility.
So the question is whether there is enough vertical play to offest the smallness. I have considered adding an extra area beneath the center, perhaps connecting the bunkers, or adding granger escape vents in certain places.
Each version of this map has been more alien friendly than the last. If you have suggestions to make UTCS more alien friendly Odin, then please share them, that's exactly what this thread is for.