Multipool.us seems to be the only pool that I've seen having so many orphans.  How are the connections into the network?  I'm not seeing the blocks claimed as orphans hitting the network as a fork so seems they are hitting the network delayed behind the block that was accepted.  But with profit switching pools coming on and off when difficulty changes I'm not surprised that there could be more orphans during the low difficulty periods when large amounts of hashrate move onto the network.