You could use nonce to determine what server to use. But I didn't want to choose directly, just the ability to chance the output of the hash for whatever reason

You could use nonce to determine what server to use. But I didn't want to choose directly, just the ability to chance the output of the hash for whatever reason. I did not want to use just any non random rebalancing mechanics to avoid advesaries attacking that implementation. With a hash the output is deterministic, but unpredictable.