I've been studying this for some time and did some research on it.
Top of ski heat... Skis are not going to break down under our iron's heat, especially after the ski was put together with a lot more heat than we produce in our irons. Let the ski get warm but not hot is the best advice. About right is the temperature of water you'd wash your hands in without saying, "Yikes!"
Iron temperatures- These can vary. I have one iron at setting 3.5 which is right. I have another iron at 2.5. At 2.75 this puppy is terrible!!!! Probably a bummer of an iron. Anyway, ...
Get a digital thermometer at Kitchen Kaboodle or wherever. Lay it across your iron and set the iron for 248°. This is the optimum temperature for warm temp wax absorbtion rate. It is also the temp where you won't melt the base of your ski at a slow walk as you make your passes down your ski.
I learned this at the Toko waxing clinic a few years ago. They even gave us the charts on absorbtion rates.
I make 3 passes on each ski and wait 10 minutes to let the ski cool down a bit. That is one set. I do this again 3 to 5 sets. It's not how much wax you use but how often you wax. Each pass opens up the pores of the base and pulls more wax inside. I've seen the pictures of this. It's neat!
Some have said, "Bob, you don't need to do it that many times." Well, the results are great! My customers have raved about the wax jobs I've done for them.
I'm sure there are many good ways to wax. This way has worked for me extremely well. I explain it all at lacyslatherworks.com bob's ski page. And it's free! Well... I will accept a season pass to Vail, a fifth of Black Jack Daniels, and all the beans I can eat!