From the pictures, the Quest looks to be deigned for a tour bike. I can't comment further on it, other than they are correct. When things are ginning correctly it will create a venturie effect and move air.
Here is the kicker. Sounds like you are pushing a barn door down the road. It is hard to say since we can't see you. Hot weather takes some special considerations to keep you safe, fresh and even alive.
I suggest you read and take heart to this, http://www.ironbutt.com/ibmagazine/I..._62-66_Hot.pdf
Some if it may sound insane to you, but it works and is comfortable. You need to start testing it now, and figure out the small things that will make it work best for you. 115 degrees in the middle of the desert isn't the place to realize you made a poor equipment choice. Check out jackets to make sure you have good sleeve cuff openings, good gloves, good boots, and yes solid leather is better than the new "vented" stuff in extremes.
Enjoy the trip, stay away from alcohol, drink lots of water, and eat balanced meals. Take your time and if you feel anything your of the ordinary, stop. It any save you a day or two of road time and even your life.
Sorry for the book. Cheers