Take a look at the ו of Velo, the top of the head is a almost the same size of the yereich (since the Yereich is pretty thick). The bottom of the head sticks out fine. I know there is an importance of Rosh Keonkios (some opinions suffice with Rosh Mashehu), would that apply to the entire head from top to bottom or just the bottom is enough?
Note that the Ksav Chabad is to specifically have a wider bottom of the rosh than the top of the rosh see the second picture. However certainly the top of the rosh should clearly extend past the yeraich.