That IBA article should be required reading for anyone who does hot weather riding- if one wants to understand the science behind possible gear choices.
Evap cooling works fine in many places, especially in drier western states, but as one approaches saturated humidity, it works less well.
There is another choice which I prefer when doing full days in near saturated conditions- it is the Veskimo. The motorcycle adaptation of a racing cagers ice cooled suit. Needs to be used under clothing that blocks wind, not full open mesh....Has to be filled twice during a long day but ice is no problem- cheap at any gas station..Like A/C for your bike- except your head will still get hot unless you do something about that also.