Re: [40+ PH] SlushPool (slushpool.com); World's First Mining Pool
i don't believe his honesty 100% now.i have a clear feeling that from time to time he is not sharing the blocks foud. i know for sure that he has another pool server with another adress for pool login because i was invited in a while back ago. my speculation is that he is broadcasting blocks from time to time from the second one.....so...sadly i'll leave this pool also 
You know what you are hashing, right?
Pool sends you work which includes coinbase address. If it sent some strange coinbase address (not official one belonging to Slush), you would notice. If it sent Slush's pool Coinbase and then Slush used another server to broadcast that block, reward would still go to Slush's pool and you would notice. I do not understand your problem.