Where should I set the centre on my ski boot. Should I mount it true centre or classic mount. I'm skiing on the Nordica badmind 2017 170 cm. I'm 15 years old and an intermediate skier. I'm 175cm(5'8) tall, 60kg (130 lbs). I ski groomers and park. I wan't to carve better but also being able to do backflips in the park. Also what should my DIN walue be?