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.
My best hash rate is right around 80-83 degrees.
Anything less than 75 and they're losing 20% of the hashrate. They seem happy to chill around 80-82 degrees with fans around 4500 to 5400 rpm
That's interesting....Mine are in the 59 to 61 range. I wonder if that has anything to do with it? I need to monitor carefully because during the day we have a window open and the high cfm fan sucks a lot of heat out. In the evening, we lock it down and the room runs warmer. I've noticed my hash seems to do better in the top right corner of Kano when I monitor it from home (windows shut).
I will be doing a little recon into this now and collecting some data. Thanks for the info, I'll see if it holds true over here.
gl man. Yeah I have mine in a shop, separate building than my home. Its small, only 120 sf with a 9' ceiling on a 4/12 pitch for a total volume of around 1000 cubic ft. I started leaving the window open a little but noticed that if it got too cold they lag.

let me know if you want any other infoz
Looks like I haven't checked the temp in a while. Was showing 39 and 40's !! I shut the window and the room got hot quick, it shut off an S7 that I could feel the heat radiating off of. The Avalons jumped up to 66 and 72 but I opened it back up afte the S7 pooped on me. Now window is open and they are all going. I guess I'm stuck at this for now. I just feel like I'm losing around 8-9 TH/s total based on calculations.
11x A6 @ 3.5 TH/s each +
4x S7 @ 4.73 TH/s each = 57.42 TH/s
I'm showing usually 48.72
All issues coming from the Avalons. Through the controller's page, they are only hashing around 2380-2700 gh/s per machine. Some higher, some lower. I've switched them around, but then that machine will do higher while a different now loses. So confusing. I've given up on this before and it sounds like I'll have to do it again. Hard to to though.