clayton, why dont u arrange your barricades as to have a choke point, this way u can filter the zombies through a small chanel that is line with wire traps, no barricades get destroyed and it is still a "proper" defense
suggestion to reduce late game upgrade times and prevent someone from maxing everything and having nothing to do. Why dont u make it so once u reach lvl 30, u have the option to relocate to a new compound, in a locked part of the city, (basically start again) u would have to rebuild your new compound, however better and new buildings are available, and mission times get reduced back to say 10 mins for lvl 31 missions
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