One major issue I could see is the spawn area "near" the main doorway has the exact same problem that Nuke has. It's just wasted time running to a place that gets nothing done, and is never used for the rest of the game. Unless it's specifcally for balancing the timing with the other spawn area (in which case you should add some kind of use to the area, maybe to allow weapon saves), you should move the spawn up closer to the doors.

https://www.youtube.com/watch?v=geVYgZa7Z0Q&feature=youtu.be

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