Carefully take a spoon and work the foam down in that precise area behind the seam.
It worked for me, I found mine was just a little tight on the forehead area.
Repeated working with the back side if the spoon made the helmet fit perfectly.
There is a flap under the lining that is for covering the two vent holes if you choose. That extra thickness bothered me too. I had to use a small mallet to reshape the foam. Even with the mallet it took several tries but now the hot spot is gone.