Greetings! New guy here. I am looking for a helmet but the issue is with my melon. It's so big...it has its own gravity. And weather system. My size is 8 3/8 (hat) or 66.5 cm or 25 3/8". Giro and Bell are two of the manufacturers I looked at but they only go as high as 8 1/8. I am willing to spend whatever cost necessary to protect my melon: do you guys have any recommendations? Thanks in advance, Al.