what i think is that the car doesnt change its shifting down pattern as you apply the break,
going at 80 and you aply a light brake to make the car go to 60 steadily,then as the car reaches 60 you feel a slight acceleration caused due to shifting down and thats when i feel i need to press the brake a harder
whereas in manual you dont do shifting while brake
considering that the downshift causes more torque
correct me if iam wrong..
thanks