Where do you measure the 27.8 C, at pot level or at the top of the tent?
Why worry about 27.8 C........My first grow had temps ranging constantly between 29 - 39 C measured 1 m above the floor, and higher over the lights, didn't make the plants blink, not even a wink......god bless!
Chester has a thread about high temp growing here
https://www.autoflower.org/index.php?threads/high-temps-nlbb-bubblelicious.45970/