Me thinks I am wearing the wrong helmet...
I always get the dent in my forehead. However, I tighten the chin strap and am constantly loosening/tighteningthe ratchet, to control the headache issue.
DH bought me the Lazar helmet, thinking it would help this issue and it felt like a torture device! It was just too tight on my little head. I gave it to my son, who also has a little head.