lap band, advice on eating, pain and throat/chest pressure

If I eat really soft food, i'm ok. If I eat anything firmer, like gently cooked salmon or moist tuna salad, i get pressure in my chest, and a feeling like my throat is blocked down low. I'm trying to eat slowly, moist stuff, and chew a lot. I limit portions to a quarter cup or less. Today I tried a lowfat chili, and later a tiny bit (a tablespoon?) of tuna salad with lowfat mayo. i hate this choking feeling. Help? I'm three weeks post-op, and was doing great until this week. Now nothing seems to work except soup, diet popsicles and applesauce. lap band oct 4. was 300, now 272.

quarter cup is stuff like chili, semi liquid. on tuna or solid food, i eat way less.