Dennis , I based my question on my experience vegetable farming in southeastern PA.
There we had similar sized tunnels to yours - 4 that were 14x40 - 2 that were 14x76 and a 30x96.
Growing greenhouse tomatoes , peppers , european cukes , eggplant etc for a 220 family CSA.
We never used shade cloth on any of the houses even though that area has a very hot and humid Summer , the peak hot months of which reminded me of where I grew up in Georgia and Florida.
If we had the doors wide open and high roll up sides (6 foot roll up sides on the 30x96) the temps were fine for all those crops.
I was guessing that with very good natural ventilation the figs would do just as well without cutting down the light.
On the narrow houses like 14 footers , the ones with tall sides, rather than those single piece ground to ground hoops, allowed for much better ventilation with higher roll up sides while still retaining the benefit of rain protection .
I'll be very interested to see what you decide after your research into this.