The only thing more awesome than those two fat blocks in 5mins breaking the bad streak is sitting and waiting for the conspiracy theories and people screaming "Switch pools! Even though they're statistically identical pool x is somehow superior!" every time slush goes >20hrs without a block. Welcome to pool mining people.
I used to feel the same way. Until the 30 day luck stayed around 85% for about 3 months. While not impossible, it is improbable.
If you to look at it solely based on math. Slush keeps 2% in fees and the transaction fees, while Kano only keeps .9%. Even if both pools were at 100% luck (which they aren't) Kano is the better place to mine.