Im 170cm, 60kg / 5'7, 132 lbs. Thinking about getting Line Travelling Circus ski for park next season. Mostly rails/jibs and smaller jumps but also some bigger jumps. I have mostly skied skis my lenght / a bit longer. I have never tried those skis and dont have the opportunity to do that so I dont know what they feel like. Which would be better 171 or 178? Also other suggestions are welcome.