One of the small o/rings in the regulator. Or change it out to the Huma. You should not have to do it, that's the only solve. I don't think those factory regs . Can handle all the pressure all the time.
WTS /Good Shape works like new. $550.00 money order or Bank check Prefered Shipping and Handling Included in the USA. This is Firm. Mod edit: WTS added to title. (Strike 1)