Have you tried a mandibular adjustment device? You can get them pretty cheap online. They push your lower jaw forward. The only real downside is that they can screw with your teeth a little.
The device was fitted by apparently one of the best docs of their kind in SoCal. And yet, after looking into it, my experience seems quite common.
At this point I've just accepted my TMJ and mild sleep apnea. Nothing I've tried has helped at all.