After mucking about endlessly, I find the best way (currently) is to scarify them a little in a small container with sandpaper around the edge filled with sand. I pop the seeds into the Rapid Rooters, sprinkle some fine sand (for reptile enclosures) on top, it seems to help with the "helmet head" and then some fine seed starting vermiculite. I have them in the tray with a humidity dome (just off for pics) and keep the lid sprayed and the rapid rooters just moist. It is sitting on a heat mat with a towel under so not too much heat. I will put them under very weak light until they pop up.
I used to soak them, used the paper towel method, tried to inoculate them with mycorrhiza now it's just back to simple. I usually get 100% germination, and the damn helmet head, I don't know 100% if the sand helps but as they push up through it I think it helps shed the shell or loosen it. Sand doesn't seem to harm the babies at all either.
Thanks for going through all that! I use rockwool and many, if not most, come out with a helmet. I might try to use some sand next time to help get the helmet off there...
Thanks again!