I'm also seeing reported temperatures *much* higher (~20C hotter) than what the bitmain stock firmware reported.  I'm just not sure if the two are reporting the same measurement -- if not, they're not really comparable.  If these are the same measurements though, that's not great.

My S9's are in an air conditioned room at ~15C ambient air temp.

Stock bitmain 13.5TH: 65-70C reported temps
Braiins at similar hashrate: 85-90C reported temps

I sent in a ticket to braiins to ask for clarification...