after overclocking T9+ with full fan RPM, I am getting 15.5TH with 2300W PSU.
BUT the tempruture goes to 110 degree. are you running your T9+ on 110 degree? is it safe? I don't want to burn the hashboard.

please advice.

I am running a T9+ with two boards at 850 MHz, peaking around 109C. It's been stable at that temp for weeks. I had disabled the temperature protection earlier and melted one of the chips in the low 120C range. So 110C should be fine.