Advice Needed- New Grow Tent Cooling

Cato, where are you measuring your temps from -- where is your thermometer located within the tent?

At the base of the tent, my tent is 120cm tall so I reckon about 40-50cm below the lamp ?
I have a black tray at the bottom with 4 black pots aswell, does that much black do wonders for heat

Thinking of just buying a more powerful extractor fan to be honest, this 4" TT is hardly creating circulation which I think is the main issue.