I've made pitas about 3 times now and having a puffing problem. The first time I got pockets, however they were very thin on the top and thick on the bottom. Second and third times I got uneven puffing and also no puffing at all. I tried raising the oven temp - from 400, to 450, to 475. Using yeast bought a month ago, works fine in rising the dough and in my other breads. I preheated for 2 hours or so this last time, to make sure the oven was thoroughly hot. Using tiles that are always in the oven. Tried rolling and hand shaping the dough to be very thin as recommended by others on the forum. No dice. What am I doing wrong? I follow the recipe, using whole wheat and AP. The big difference I can see is the first time, I made 7 "large" pitas and the second and third times I made several smaller ones. Is it possible that somehow there's uneven temperature in the oven, or on the tiles? Sometimes even in the same batch some pitas have a pocket while others don't or just look lumpy.
Side view of problem pitas.