was assuming C1 - C4 were chip temps but must be for the board, but whether it represents an average chip temp I'm not sure.

lmao. just read the above posts and you guys are correct. my z1 temp doesn't change, the z1+ does and it doesn't look pretty. z1 on 20180926 and z1+ on 20180930. I'm finding the Z1+ even more inconsistent, with hashrate and up to 20% rejected shares