Taking into account some feedback given here as well as some more play testing on my own, I've modified the level so that the middle trench is now a bottomless pit. The overshield has been moved to the top of the center bridge.
The roof is also not accessible anymore in Slayer, although a gravity launcher and some open windows will spawn in Strongholds and CTF, offering another escape route from the main bases. The glass doors from the previous versions -one which used to require a keypad input before accessing the overshield and two at the entrance to bases in CTF - have all been removed as well.
I also did some general cleaning up around the level, making a few corners more flush and adding a little bit of lighting here and there to make the map more readable.
I'm calling this version 0.91 because I'm still anticipating a few more modifications as play testing continues. Please let me know if you have more suggestions for improving the flow and thanks for taking the time to play / download it!
File name remains "Power Strip". I have several backup versions in my file share but they are all denoted as such.