Trouble making corn tortillas
They may be too thick. You can try placing several pieces of paper or thin cardboard into your tortilla press to get thinner tortillas. (If you aren't already using plastic or wax paper to press the tortillas, then you'll have to start, so that the paper doesn't stick to the tortilla.) Experiment with several different thicknesses until the cooking is more uniform/faster but they're still thick enough to support the food.  (You'll also need to modulate the heat.)  Once you find the right thickness you can just leave the extra sheets of paper/cardboard in the press for future pressings.