I ran it back for 24 months and the variance was only about $1200. I was surprised to see that no matter the time range I use that kano was actually a lower net payout, but not by a huge variance.
I was surprised since the Kano YTD on the home page was always higher than slush. But I see that right now it is lower. With the two soft months in a row on Kano, that drops the values down. When we find a block, the Week, Month, quarter and YTD will probably be over slush again since we get paid hundreds (or thousands) of times more per miner Th.