The current routing configuration is the problem, as far as I can tell. Your subnet attached to em0 (178.x.x.x/255) does not have any routes defined.
Example: An inbound packet from 1.2.3.4 to 178.x.x.x will get a response from your default route and its IP address, 78.x.x.x. That return packet will be dropped by 1.2.3.4, as it was unsolicited.
You want to define multipath routing. FAQ 6.14 may be a good place to start.
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