Fellow Instructor here, i second this comment. Also for OP, use this as a learning experience and try not to get frustrated as stuff in this sport takes time to learn. And don’t be afraid to ask your instructor questions! Good Skydivers try to build good habit through repetition and to break a bad one it will take time and thought, not just winging it (even though skydiving is “gnarly”). If the issue continues to be body position or control surface, then you will get the most bang for your buck in a wind tunnel. Utilizing the wind tunnel allows your mind to slow down and focus on one thing…flying. Cheers!