I like to fry corn tortillas for taco shells, tostadas, and chips. I’ve done this successfully many times, but lately the results have been really greasy and I don’t know why. I keep the oil at 350 and I’ve tried several brands of tortillas. It seems that maybe the tortillas are splitting and oil is actually getting trapped inside. What would cause this splitting? Are the tortillas just too old? Sometimes I have them around for a week or two. Thanks for any advice.