Look I dont know what is wrong with you but Beta Grow Chicken breasts and tenders are great. I believe you are severely overcooking them, especially if you even consider a pressure cooker. In your oven a seasoned chicken breast of 280-340 grams should take about 25 to 30 minutes at 180. Invest in a meat thermometer and it should read 165 degrees.
Been cooking chicken in the oven this way for over 50 years.