Airflow would definitely help but this might bring on another issue, resistance. The more wires and connections you have the more resistance there is which will induce heat and reduce efficiency.
I’m rebuilding my vruzend pack from 14s20p to 13s 17p to reduce weight, and make changes by going from two to three bus bars per series connection, and stepping up to two 4 gauge wire instead of 8 gauge. As well as adding an active balancer on top of the bms. A better way to cool batteries might be to make an air duct that diverts air from in front of the paramotor to the battery, just like how aircraft engines are cooled.