I connected two instances of cgminer to nicehash and middlecoin. Both were switching to the same coins at the same time, convincing me that the hash buyer was mining at middlecoin. Middlecoin always has a 1024 difficulty and fast switching, causing high rejects and low hash rates.

Changing the effective difficulty at the proxy will not be trivial, but it would make mining pools like middlecoin much more productive.  I would like to see that implemented.

Why anyone would pay 5.5 btc/ghs/day to earn half that at middlecoin is beyond my comprehension though, unless its h2o himself.