Looks first as though she needs a cheek riser or to use the method of a lower jaw weld like you which is also what I do. After getting the weld to the stock established just practicing with an unloaded rifle at picking the target and then transitioning it from eye to scope smoothly is the key...
I am a new member. Can you tell me if the At One stock and the Pro Varmint stock have identical recoil pads. I found a listing for prefit pads for the At One and I own a Pro Varmint