Yay progress! The roll up is looking on course! For the back balance, check in with you abs/glutes to makes sure the legs are being supported up towards the pole. If the low abs are not engaging the legs towards the shoulders, the legs can pull the shoulders upright. It’s a tough activation because you still want to keep the hips open, AND the abs controlling the legs.
As long as you are content and your body is safe, keep going!!!