AURA Sx Plus AMT city driving experience

1) I purchased from Sarjapur show room in bangalore. Buying experience for cool. I am first time driving an automatic car. I have been driving manual vehicles for about 30 years. Initially for about 10km, i felt automatic is not in my control. After driver about 20 km, I love to drive the vehicle. I used Desire ZXI manual before for about 10 years. The clutch for for Dzire was very hard. I got back pain due to driving in city. Also get tired after changing the gears. After driving aura in city for few hours, i don't feel any tired ness. Easy to operate...I love the map and audio, and the screen....More than I expected....Only disappointed thing was the safety rating by NACP...Even through Hyundai is claiming 65% percent steel. Why the rating low...What changes Hyundai made into the car after announcing the result???