The skull brute activates at the line shown in the videos. There is a period of time where the damage hitbox isn't active while the animation plays, so we want to get on the right side of the skull brute before it's active. Time your pogo to be at that line to make it more consistently :3
Figured out a consistent setup for a heal skip in deep docks. You can get the silk either in the room or before. Guide with examples here: https://youtu.be/J9oTLOPXuYA