Ok... so at the 56 min mark I watched all 10 blades keep switching servers for about 2 full minutes, but nothing was actually leaving the blade and hitting either BFG or the proxy.

So the blades are just sorta quitting mining and frantically trying to recover by switching servers. 

The two servers it's swapping between are both the same IP, so I guess the next step to eliminate any last variables will be to have a different IP in the config.