Misti Demonia

Hello, I am having issues with the Sophie Bento head. The skin is matching perfectly but there is a feathering around the neck where the head meets the body. it is NOT the skin issue its the head size issue. I have head set at 0 and have tried all the different sizes. I have a maitreya body. Can anyone help me? Also the teeth wont change for the head. It stays at Vamp and wont go to normal teeth. Thank you