I switched to another pool when kanopool had about 100% busy finding a block (sorry).
Is it correct that I do not get paid for these contributions when the pool reaches 600% and still no block found?
As long as your Shifts to which you mined are in the 5ND window, you will get paid for those shifts based upon your ramp up or ramp down in this case. If they don't you won't. Do the math.