Replying to Rotation tips

Howdy amobeas, I'm looking for some help. I'm a decent skier, can go all over the mountain etc and I'm looking to take my park skiing to the next level. I've done 1s and a handful of 3s but I'm definitely not comfortable doing them. This includes rotating onto boxes and such.
Just looking for some advice when it comes to said rotations. I know one thing I was doing was using too much shoulder and not enough hip when launching the spin. Anyone got any other suggestions?