Why does the milk do this?

Hello fellow baristas, I am trying to do the pegasus however I am struggling doing the legs and the head because the milk kind of spreads on top of the crema. Also by the time I do the head the milk is super thick so i cant get a thin shape.Yet if it make the milk any thinner I dont have anything foam left for the legs/head.

Picture one is in a double shot and pitcure two was in a triple shot. Picture 3 was in a small cup with macha, the milk dosnt spread in matcha like it does in our espresso.

I have mastered other patterns like the swan, flying swan, eagle, rabbit, squirrel, rosseta, tulip, rose, seahorse.

This one is the hardest and I dont know if its me or the milk/espresso because our milk is really temperamental. One batch is nice and silky smooth and other times its more 'sticky' and dosnt flow through the coffe really well.

Please help me guys 🥺