What I am saying is if it was that High for Me "I" would be sweating. I do not live where you are so Just do what gives you the best hatch for your Location.
I am not one that accepts a 50, 60, 70% hatch of fertile eggs. I kept changing until I got high 90's on the % hatched---even 100% a lot of times and I am not talking about with 20 or 30 eggs I am talking about with 100, 200 even 300 eggs at one hatch per week. If I put 250 eggs in the hatcher and 250 hatch----that's pretty good in my opinion---even if 250 went in and only 247 hatched----I am not 100% happy with that but its a good hatch. Then to be able to do that week after week, 1000's after 1000's means the recipe I use for hatching is a decent one. You and All hatchers be willing to change if needed to get as close to 100% as you can. I set 72 broody hens in just 2015 and all 72 hatched and "just about" 100% hatch(of fertile eggs) across the board for them. I felt if they can do it "out there" I should be able to do it "in the incubation room".
So to answer that question----Yes, its to high for me for the "incubation" but not the hatch! As Always Good Luck with your Hatch!