Honestly I used to point my 3rd to a PPS pool and after a year or so I realized that Kano is so rarely down (and comes back up so quickly) that I never got enough on that account to ever get a payout so I just put in another Kano node.  Now I never have to wait to fail back to the 1st pool so I never miss a beat.  Some even use a solo pool as their 3rd as a lottery ticket for those rare fail-overs.

Which nodes are you currently using?  Have you ever checked them by pinging to see which ones have the fastest trip time?

EDIT:  The speed from you to Kano is limited by the slowest link along the route and it could be a glitch in a segment along the way that keeps knocking you off.  I just finished pinging all of the nodes and they are all fine for me except sg.kano.is.  It would not respond to me at all.