My ortho said that my back teeth should be able to bite together again within a week or two but they don't seem to have moved at all, they're still quite far from meeting!

I also wonder if this is because I clench my teeth at night (well, I'm pretty sure I do, I wake up with sore teeth and jaws but I'm not sore during the day). Maybe I'm preventing the Herbst from working?! Unfortunately, they don't really make mouthguards for Herbsts, I have to take the appliance apart (take the rods out of the tubes by opening my mouth wide) just to wear my rugby mouthguard, which is made for braces (I never have my rugby mouthguard in for more than 1-2 hours at a time, it's only a couple times per week).
I know that a lot of people think that the Herbst doesn't really work for adults, but I thought it still move teeth, it just couldn't grow your jaw?
Just thought I'd complain a bit. . . I figured you guys might understand. . .