I used my thumb and just pushed the offending section a bit. Little by little. I was only dealing with discomfort in an are 1 cm wide at the forehead though. Perhaps a large would suit you better with a thicker foam liner? I don’t know if they sell them but some manufacturers do? Hth
I’m coming to that conclusion too, I might try a thinner scalp pad but it seems pretty thin on the Shoei (not ‘shoe’) already.