Not bad man!
thats the mask i did it to, and it made it look more narrow
I just saw this old thread and wanted to say that there is a anti-snoring device that works well. It goes under your chin and around the top of your head. You can pad up even more under it once it’s on. Can get uncomfortable after a bit… but would be really useful for a display and mannequin head.
The simplest way is to simply open your mouth 
My head is big so I can’t really get a Castle stretch besides with the H78 and my old Fear but just opening your mouth inside of the mask gives you a nice stretch
Pretend you’re a Saturday night hooker in need of rent money
I recently bought a new Michael myers mask and it is very tight and snug on my head and face. What is the best way to stretch it out to fit better?
The more you wear it the more it will stretch, this is due in part to your warm and humid breath.
Try using a hair dryer to pre-warm the latex. Don’t use the hot setting, and don’t get the hair dryer too close to the mask. You’re just trying to make the latex loosen up a little.
This is sort of a temporary deal, though. Once the latex cools it will regain its original elasticity and fit.
Again, the more you wear it the better it will begin to fit, or so I’ve found with my own mask.
Good luck.
HEDGE