How to make my chicken taste more tender?
This is normal. Chicken breasts are leaner than legs, thighs and wings, so they dry out faster. I often make a similar dish, but I use pre-cut pieces and dark meat for this very reason. 80 minutes sounds like a long time to me, you could probably reduce that and get a better result. You could also cut the breasts off and take them out early to avoid overcooking them.