Replying to K2 Domain Size help! Please guys!

Hi everyone, I'm from Argentina so sorry for my english. I have a pair of k2 domains, they are 159, and I wanna know if they are to short for me. I'm not tall, actually I'm kind of short, only 174 (I don't know how many feet) and I'm thin, about 74 kg (No idea in pounds). I use to be 70% on the park and a few runs just to have fun with friends that don't ski at the park. I like fun boxes, riel, walls, and that kind of features, also jumps. I will say like 70% boxes and that things and 30% jumps (not that big). So, please help! I wanna know if I should sell them. I have a pair of Rossignol Storms in mind (170). What you think?