I wonder if the F-35B will be worse than the blast from the F-4K which was set well below the horizontal due to the installation of the engines and the AoA for launch from the ship. I remember reading about the Phantom trials aboard HMS Eagle required a steel plate to be fitted to the deck to protect the ship with fire hoses used in between launches to cool it. It seems like this problem is nothing new and I suspect a storm in a tea cup.
Engines -
I should have been more clear than saying at the front (bow cats) and half way back (waist cats).