Hi Jill,
One thing you could try is reaching up a bit higher on the tail before you twist into the arch position to climb up. As you twist into the arch, make sure to keep at least one arm bent so you’re not going into an intense shoulder stretch. As you twist into the arch, be sure to bend the leg that’s in the ankle hang right away and “pull down” with that ankle hang ankle as you climb up to help take some weight. You can also just practice rotating into the pull up arch and just practice holding that position with bent arms and then twisting back before climbing out in the standard way until you are ready for the arched climb up.