Hard times, without finding a block it's even harder to stay at Kano for me - even when you get much more % share of a block compared to slush for example, if there's no block withing 80 hrs now it might be better to switch back to another pool?
You've got to do what you think is best. You've also got to take the good with the bad, this is the nature of Bitcoin mining.
Before you bounce though, look back through the thread and see how many people came back here, regretting how they left
during a hard spot. Goodluck!!!