Hi
Have you tried, Best Friend Grazing Muzzles, they come with muzzle accessories to help prevent rubbing. Couple of people I know use them as they found the Green guard ones rubbed.
I had a lokk on there today as i'm looking for a new horse and the numbers have gone up a little since the holidays are over, I think it just got quite everywhere over the holiday period. But they do have 12 Haflingers on there you can search by breed! <font color="purple"> </font>