wouldn't worry too much about what you see on your S9s...that's been doctored by Biteme in BMminer.  I would focus on the errors shown on the Kano Workers page and then only to verify that it is close or lower than the Invalids shown at the top of each Kano page.

I do notice that too cold is bad.

For reference what are we calling "Too cold". Less than 70? Less than 60? I still have no idea where everyone else's system runs. Lately my 4 s9's have been enjoying the cold snowy air in Arkansas and the spread ranges from 62c chip temp to 77c chip temp at the moment.