Thanks for your very interesting opinion.
These containers are inside a warehouse. So, IMHO, the insulation you are talking about is perfect if the high temperature are caused by direct sunlight. But, in this case, the ambient air itself is at high temperature. The most important insulation we have is intake air from output air.
Humidity is not definitely something to not worry about. I think the biggest problem in this type of containers are the close distance between the pads and machines. The farther the better.
We are running this type of containers more than a year ago. Not much problem have caused any than rust in fan grill. Other farms nearby have adopted similar cooling systems since mid 2017. Their biggest mistake was miscalculation of air flux (sorry for this dull vocabulary and not explain with technical terms). I have not heard yet some big problem caused by humidity in these farms. In raining conditions or extreme humidity, of couse, we switch off the water pump.